Philosophy A Short Introduction What is Philosophy? Philosophy is about: – Finding answers to serious questions about ourselves and about the world we live in: What is morally right and wrong? And why? What is a good life? Does God exist? What is the mind? What is art? Is the world really as it appears to us? What can we know? …and much, much more – Questioning existing knowledge and intuitions to get closer to the truth What will you do when studying Philosophy? Philosophy is different from many other arts subjects: – To study philosophy you have to do philosophy We analyze and criticize existing arguments We construct our own arguments – We use fun thought experiments too What will you get out of Philosophy? Skills that will help you: – With your other studies – Good career prospects – Understand yourself and the world around you – Prevent being conned and duped What will you get out of Philosophy? The skills are: – – – – – – Critical thinking, Argument skills, Communication, Reasoning, Analysis, Problem solving… Which allow you to: – Justify your opinions – Spot a bad argument, no matter what the topic – Explain to people why they are wrong and you are right – Philosophy basically teaches you to think! Health & Safety Warning: Philosophy can be dangerous! – You’ll have the skills to poke holes in just about everything anyone says (which often doesn’t go down so well) – With great power, comes great responsibility – Make sure that you use your powers for good! Ground Rules: Philosophy is not angry debating or arguing – Don’t make others feel bad by arguing them into a corner – Don’t pick holes just because you can Be charitable (it’s what good philosophers do) – Be constructive – work together to find the truth! – If you all respect each other (and me!), then you’ll all get the chance to have your say The Philosophy Subjects What is it to know something (and how can we come to know something)? – Epistemology, philosophy of science, logic What is there (and what are the natures of these things)? – Metaphysics, philosophy of mind, philosophy of religion What has value (and why)? – Aesthetics, moral & political philosophy Knowledge What can we have knowledge about? What does it mean to have knowledge about something? Where can we get knowledge from? How can we get knowledge? Are we just brains in vats? Can we be sure we know anything?! Descartes: “I think, therefore I am” Metaphysics What is time? Is time travel possible? Was there time before the universe? How did the universe start? What happened before the universe? Is everything in the universe caused? Is it possible for us to have free will? What is the meaning of life? Philosophy of Religion What are the arguments for believing in a god? Do those arguments give good reason to believe in a God? What are the arguments that certain kinds of Gods cannot exist? Do those arguments give good reason not to believe in a certain type of God? Why would a God who is all powerful, and all good let bad things happen to innocent people? Aesthetics How can we tell what is art and what isn’t? Is popular art bad for us? Why do people enjoy watching scary movies? Moral & Political Philosophy Are there universal moral facts? What is the best possible life someone can have? What makes actions morally right or wrong? What is the best form of government? Are human rights real? When, if ever, is it permissible to go to war? Applied Ethics Applying moral theories to current real life situations to assess what we should do Topics include: – Animal rights – Environmental ethics – Euthanasia – Abortion – Cloning and genetic engineering – Business ethics (e.g. is advertising immoral?) – Global poverty Let’s do Some Philosophy: Two Thought Experiments The Trolley Bus Problem and the Spare Parts Surgeon are examples of problems you will find in ethics courses We can use thought experiments like these to work out what is going on when we make a moral judgement and… Give insight into what makes moral judgements right and wrong The Tram Dilemma An out of control tram will soon kill 5 people who are stuck on the track. You can flick a switch to divert the tram to another track where only one person is stuck. Should you flip the switch? Should you kill one person to save five? SWITCH The Surgeon’s Dilemma You are a surgeon with six patients. Five of them need major organ transplants. The sixth, an ideal donor for all the relevant organs, is in hospital for a minor operation. Should you kill one person to save five? What’s going on here? Should you kill one person to save five? – Trolley Dilemma = “yes” – Surgeon Dilemma = “no” If you have two conflicting intuitions then either: – there must be some morally relevant difference between the two cases, or – One or more of your intuitions is wrong – So which is it? Philosophy #2: Moral Theory The Philosophy Subjects (Again) What is it to know something (and how can we come to know something)? – Epistemology, philosophy of science, logic What is there (and what are the natures of these things)? – Metaphysics, philosophy of mind, philosophy of religion What has value (and why)? – Aesthetics, moral & political philosophy Back to Moral Theory We want to know what makes actions morally right or wrong… And, how can we know? Moral ‘common sense’ might not be enough (Remember) The Tram Dilemma An out of control tram will soon kill 5 people who are stuck on the track. You can flick a switch to divert the tram to another track where only one person is stuck. Should you flip the switch? Should you kill one person to save five? SWITCH (Remember) The Surgeon’s Dilemma You are a surgeon with six patients. Five of them need major organ transplants. The sixth, an ideal donor for all the relevant organs, is in hospital for a minor operation. Should you kill one person to save five? What’s going on here? Should you kill one person to save five? – Trolley Dilemma = “yes” – Surgeon Dilemma = “no” If you have two conflicting intuitions then either: – there must be some morally relevant difference between the two cases, or – One or more of your intuitions is wrong – So which is it? Morally Relevant Differences? You guys try to spot some And I’ll try to explain them away Did Our Moral Common Sense get it Wrong? Should you kill one person to save five? – Trolley Dilemma = “yes” – Surgeon Dilemma = “no” Does anyone think one answer is wrong? Jungle Dilemma You are trekking alone in the Amazon. You discover an evil army officer and his troops rounding up villagers. Unless you kill one, the troops will kill six. Should you kill one person to save five? Jungle Dilemma Cont. What if there are 2 villagers? What if there are 10 villagers? What if there are 100 villagers? Can you ever kill one innocent person to save many? Two Main Methods Consequences (consequentialism) Fixed rules (deontological) – You can/can’t/must/mustn’t do X, Y & Z Or a combination (this counts as deontological) Are there any rules that will never need an exception? Example: Pushing In Is pushing in generally wrong? What makes pushing in wrong? Is pushing in ever morally permissible? What can make it (morally) OK? Deontological Who decides what the rules are? They need to be consistent They can’t be too specific Perhaps a rule for making rules? Divine Command Theory Right acts are right because… They are the actions that God commands we perform Problem: The Euthyphro Dilemma… The Euthyphro Dilemma Either (1) The act is right only because God commanded that we do it Or (2) God commanded that we do it because the act is right for independent reasons (1)= morality and God’s commands are arbitrary (2)= abandon Divine Command Theory The Law Wrong acts are wrong because… They break the law Problem: Do we always feel like we have done something morally wrong when we break the law? Cultural Relativism Right acts are right because… your culture approves of them Four Problems: 1. Can’t criticize other cultures 2. Can’t criticize your own culture 3. No moral progress 4. It’s just not how we decide in the hard cases The Golden Rule Right acts are right because… they are the ones you would want done to you Problems: 1. People like different things (e.g. Masochists) 2. Is it how we decide in the hard cases? Kantianism What makes right acts right? – An act is right if its maxim treats humanity as an end in itself and not merely as a means Maxims are: – Like policies – What you intend to do in certain situations Consequentialism Evaluate the likely consequences of each possible action Then compare them But what criteria to use to evaluate?? – Happiness? – Preference satisfaction? – A lot of things? Philosophy #3: Philosophy of Religion The Argument from Evil (P1) If God exists, he is omnibenevolent, omnipotent and omniscient. [By Christian Definition] (P2) An omnibenevolent being would prevent any unnecessary evil if she could and knew how. (P3) An omnipotent being could prevent all unnecessary evil. (P4) An omniscient being would know all about unnecessary evils and how to prevent them. (P5) Therefore, if God exists, there is no unnecessary evil. (P6) But there is unnecessary evil. (C) Therefore, God does not exist. Defining Unnecessary Evil Evil is suffering of an innocent Unnecessary evil is the suffering of an innocent that does not create some compensating good So, for P6 to be true, there just needs to be one occurrence of an innocent person suffering without some compensating good For example: – A child being tortured – A child being horribly burned by a meteor strike Potential Objections (to P6) Suffering is not really a bad thing. Suffering is always a form of deserved punishment. Evil is an illusion; people don’t really suffer at all. Evil is necessary for a greater good that our finite human minds could not hope to comprehend. Evil is necessary so that we may know the contrast between good and evil. Evil is necessary in order for us to exemplify virtues. Evil is a necessary consequence of free will. Evil is a Necessary Consequence of Free Will God gave us free will Some people use their free will to create evil God could prevent all of us from wanting to do evil, – but then it wouldn’t really be free will God could make ‘nature’ intervene somehow to stop us from doing evil, – but then the laws of nature would not be consistent and it would be very hard for us to predict consequences. – This would make having free will pointless (because we choose to do things based on what we expect the consequences to be) Therefore, there is no unnecessary evil Is All Evil Necessary for Free Will? Recall the example: – A child being horribly burned by a meteor strike A Common Atheistic Argument (P1) There is no evidence for God’s existence (P2) A lack of evidence is reason to believe there is a lack (C)Therefore, there is reason to believe that God does not exist So, no evidence is not neutral; no evidence of something is a reason against it A Type of Reply: Cosmological Arguments Cosmological arguments try to posit incredible things about the universe that need an explanation. God is suggested as the best explanation. Together, the argument and the suggestion are evidence that (some kind of) God does exist. So, the atheistic argument is wrong. A Type of Cosmological Argument: The Fine-Tuning Argument (P1) It is an indisputable and yet remarkable fact that the universe appear to have been designed. (P2) The best explanation for this appearance of design is that the universe really is designed. (P3) Inference to the Best Explanation: it is rational to believe the best explanation for an observation. (P4) Therefore, one should believe that a designer of the universe exists. (P5) God is the designer of the universe. (C) Therefore, one should believe that God exists. Evidence for P1 of the Fine-Tuning Argument If the initial explosion of the big bang had differed in strength by as little as 1 part in 1060, the universe would have either quickly collapsed back on itself, or expanded too rapidly for stars to form. In either case, life would be impossible. Calculations indicate that if the strong nuclear force, the force that binds protons and neutrons together in an atom, had been stronger or weaker by as little as 5%, life would be impossible. Evidence for P1 of the Fine-Tuning Argument (Cont.) Calculations by Brandon Carter show that if gravity had been stronger or weaker by 1 part in 1040, then life-sustaining stars like the sun could not exist. This would most likely make life impossible. If the neutron were not about 1.001 times the mass of the proton, all protons would have decayed into neutrons or all neutrons would have decayed into protons, and thus life would not be possible. If the electromagnetic force were slightly stronger or weaker, life would be impossible, for a variety of different reasons. Arguing Against P2 of the FineTuning Argument Some physicists believe in M-theory M-theory explains big bangs and all phenomena we experience (without positing a designer) What is the evidence for M-Theory? – It’s under construction So, Is a God the Best Explanation? Even if M-Theory is true, where did all of the strings come from? Maybe God designed M-theory. But, who designed God? Is there really any good evidence for any position? Philosophy #4: Are We Brains in a Vat? Easy Questions What did you eat for breakfast today? Where do you live? Do you know what the time is? Hard Questions How do you know what you ate for breakfast today? How do you know that your experience of eating breakfast today was not an illusion?? How do you know that everything you have ever experienced is not illusionary? How do you know you are not in the Matrix? Dan’s Skeptical Argument (P1) For any of you have knowledge of anything, then you must know that you are not in the Matrix (P2) You cannot know that you are not in the Matrix (C) Therefore, you cannot have knowledge of anything The Movie Theatre Model of the Mind But Do Our Sense Organs Ever Trick Us? Yes We are tricked by illusions all of the time! The illusion of simultaneous touching and feeling Example of Illusions Example of Illusions More Visual Illusions http://www.michaelbach.de/ot/index.html Descartes (P1) I think (C) Therefore, I exist This argument is circular – The conclusion is already assumed in the premise It’s based on strong experiential evidence: – We have the experience of thinking Dan’s Skeptical Argument (P1) For any of you have knowledge of anything, then you must know that you are not in the Matrix (P2) You cannot know that you are not in the Matrix (C) Therefore, you cannot have knowledge of anything Time Travel Time Travel is Possible!!! This might be a hoax, but time travel really is possible – In fact, many of us have already done it Being Specific about Time Travel Actually going to the future or past – Not just some replica of it It’s all relative For me to time travel, there would need to be a difference between the speed time passes for me and the speed time passes for someone or everyone else What is Forward Time Travel? Forward time travel: my time goes slower than yours (like aging slower than everyone else) My time goes slower than yours as my speed increases (relative to yours) and/or if I am closer to mass than you (and if that mass increases) What is Backwards Time Travel? What: to me, it seems like your time is reversing into our shared past How: space-time (where I am) is warped so significantly that it creates a closed time-like loop or wormhole to our shared past The loop allows me to travel faster than the speed of light (not absolutely, but relative to our past as we know it or you watching me go through it) A Closed Time-Like Loop The Case of Jocasta Jones Follow the story and keep your eye out for: – Weird happenings – Illegal acts Jocasta’s 2000 The Case of Jocasta Jones Jocasta’s 2001 Jocasta’s 1910? Jocasta’s 2019 Jocasta’s 1900? The ‘No Destination’ Objection If you missed the first lecture, you may still believe: – That the past no longer exists – That the future doesn’t exist yet – That only the present time exists If you believe this, then time travel is impossible because there is no other time to travel to Reply to the ‘No Destination’ Objection 4-Dimensional space-time It only seems like the past and future don’t exist because we are not aware of them – ‘We’: the event that is our consciousness at this current time and place in 4-D space-time 4-Dimensional space-time is widely accepted in physics… and… Einstein came up with it Time Discrepancy Paradoxes If you missed the first lecture, you may still believe: – That time or the passage of time is a constant – That time passes the same for everyone and everything everywhere – That Newtonian or absolute time exists If you believe this, then time travel is impossible because it involves differences in how time passes between the time traveller and everyone else Reply to the Time Discrepancy Paradoxes 4-Dimensional space-time It turns out that time (and the spatial dimensions) are relative – Time is not fixed or absolute or constant The speed of light is constant, but time is relative to speed and proximity to mass – Physicists have proven this… and… Einstein came up with it The In Two Places at Once Paradox No one person can wholly be in two places at once – Wholly is important here If you believe this, (which you should) then doesn’t that mean time travel is impossible? – (because it would allow you to go and wish yourself many happy returns at your last birthday party) Reply to the In Two Places at Once Paradox Big spatial objects have different parts that make up its whole.- e.g. the North Island But, despite what Aucklanders think, the North Island is never wholly located in one part All objects are really spatio-temporal objects In this moment, I am not the whole of me – Right now I am just a spatio-temporal part of the whole that is me throughout space-time Just like tectonic plates (different parts of the earth’s crust) can rub against each other, It’s possible for me(present part) to shake my(past part) own hand at my last birthday The Paradox of Changing the Past If you could go back in time, you could do more study for the test and get a better mark But, you already have a mark! You can’t change it – its part of history now! P1) If time travel is possible, then you could change the past P2) It is never possible to change the past C) Therefore, time travel must not be possible Replying to the Paradox of Changing the Past Denying P1: Time travel is possible, but it does not and cannot change the past – When you time travel, you create a new alternate universe So you can change things, but not things from the past in our universe – When you time travel, you can affect the past because you already did You don’t change history… you had already affected it! An accurate history book would already have a record of you being there! The Grandfather Paradox If you could go back in time, you could kill your grandfather before he could produce any offspring But, if you did that, then there would have been no you to make a time machine and go and kill him! Which means that you can’t have killed him… The Grandfather Paradox (Cont.) P1) If time travel is possible, then you could kill your grandfather (before he had kids) P2) It is impossible for you to have existed if you succeed in killing your grandfather (before he had kids) C) Therefore, time travel must not be possible Replying to the Grandfather Paradox 1 Denying P1: Time travel is possible, but you do not and cannot kill your grandfather – When you time travel, you create a new alternate universe So you can kill some old guy… but it’s not your grandfather (not from your past) – But does time travelling to an alternate universe really count? Is it time travel or inter-universal travel? For time travel to be meaningful does it have to be to our own past? Replying to the Grandfather Paradox 2 Denying P1: Time travel is possible, but you do not and cannot kill your grandfather – When you time travel, you can affect the past because you already did This justification doesn’t work this time If you had already been there and killed your grandfather… then you would never have existed Replying to the Grandfather Paradox 3 Denying P1: Time travel is possible, but you do not and cannot kill your grandfather – When you time travel, you can attempt to kill your grandfather, but you will never succeed Replying to the Grandfather Paradox 3 Denying P1: Time travel is possible, but you do not and cannot kill your grandfather – When you time travel, you can attempt to kill your grandfather, but you will never succeed – It doesn’t have to be magic or Time Guardians that prevents the impossible from happening – Because it’s impossible to kill your grandfather… it’s necessarily true that you didn’t kill him – (however that came about) OK Fine, but where are the Time Travellers, then? P1) If time travel ever becomes possible in the future, then time travellers would most likely have visited our past already P2) But there is no evidence of time travellers in our past P3) It is very unlikely that the time travellers could have left no evidence C) Therefore, it’s very unlikely that time travel ever becomes possible Replying to the No Evidence of Time Travellers Problem 1 Accept the argument – It’s true that there are no time travellers… but only because: Global warming, or Nuclear war, or Super-viruses, or The robotic uprising of the (very) late nineties… – … killed off all of the humans before we got around to making time machines! Replying to the No Evidence of Time Travellers Problem 2 Denying P1: Only when time travel becomes possible (by a human creating and turning on a time machine – a closed time-like loop) would we expect to start seeing things appear from the future (recall what Dr. Mallett said) – So, we won’t expect to see anything until the first closed time-like loop is set up Replying to the No Evidence of Time Travellers Problem 3 But what about naturally occurring closed time-like loops? – If these exist in the future, then they could be used to travel to our past Sure… they could… but they would have to conveniently connect the right two locationmoments in space-time This is just like aliens possibly existing – They may just be too far away in space-time for us to ever meet Take-Home Lessons Time travel in movies is usually illogical, but Time travel is theoretically and logically possible in real life But if you have homicidal intentions towards your ancestors… then make sure that you look out for banana skins How to Find out More Want to know more about time, time travel and how they impact on other topics from this course (like free will)? Enroll in the metaphysics course next year (or the year after): PHIL225/325 Keep up with the latest science news – C.E.R.N’s L.H.C. (Large Hadron Collider) http://lhc.web.cern.ch/lhc/ – Dr. Ronald Mallet (real time machine maker) http://www.physics.uconn.edu/~mallett/main/main.htm The Meaning of Life ‘Absurd’ in the Ordinary Sense A noticeable difference between what someone intends or claims and reality A clash between the internal and external perspectives – George Bush doesn’t think he’s a kitten-eater, but… – Everyone else knows that he is Absurd to Philosophers The dramatic difference between: – Our (internal) perception of the significance of our lives – The objective (external) perception of the significance of our lives It’s absurd because, from the external view, our lives have only a tiny fraction of the significance that we feel and act as though it has Our Significance from the Inside Every event in the universe is viewed by its actual and likely impacts on us Events are only significant if they are likely to or actually do significantly affect us – The universe revolves around us We are all like this to some extent, but some people don’t realise that this is the same for other people! – You may know people like this Our Significance from the Outside Each and every one of us are completely insignificant to 99.9999999999999999999% of what exists – When heat death kills the universe, our plans would seem beyond insignificant to anything left to observe Even if we do have free will, so many of our ‘choices’ are still the result of our prior causes – Why will most of you vote for the same political party that your parents do? – Why are you (and not all the other try-hards) so individual? The Human Condition Also known as the Human Situation From the inside, our significance is paramount From the outside, our significance is basically none-existent The Human Condition is being aware of the contradiction between these two points, the absurdity of our situation Humans are thought to be unique in their ability to be aware of this situation The Myth of Sisyphus Sisyphus made a deal with the Gods and then went back on it They punished him by giving him a meaningless chore to do for eternity Nothing comes of Sisyphus’ labours – And nothing will ever come of them His existence is meaningless What if He Wanted to Roll Rocks? Imagine that the Gods changed Sisyphus’ desires so that all he wants to do is roll the rock up the hill He now gets exactly what he wants for all eternity – Sounds great! But, does this make his existence any more meaningful? Taylor on Meaning Meaninglessness is endless pointlessness Meaningfulness is activity with a point, a result, a significant culmination So, which of these best represents all life as we know it? – This includes plants and animals Is Life (in General) Meaningful? 1 Glow worms, cicadas and the meaningless cycle of life The only point of any living thing’s life is just life itself Is Life (in General) Meaningful? 2 Humans also follow and perpetuate the meaningless cycle of life We imagine that we have goals and plans, but are they really for anything other than surviving and reproducing? Even when our achievements create lasting results, like building a temple, how long will it persist and will it prevent our children from merely surviving and reproducing? The Meaning of Life is Life Itself? This answer is not very satisfying Many people have religious beliefs that centre around a departure from this meaningless cycle – Going to heaven – Becoming enlightened, etc. But which religion is right? Are there any good reasons to believe one over another? What Does ‘What is the Meaning of Life’ Mean? 1 What does life mean? (Not interesting) – To us, it means not being dead or lifeless – To a God, it might mean amusement or experiment – To a plant, it probably doesn’t mean anything What is the purpose for life? – Various religious purposes – To continue the cycle of life – There is no purpose for life – But, if there is a purpose for life, then life is meaningless!! A Purpose for Life Makes it Meaningless P1) If life has an ultimate purpose, then it must be either possible or impossible to fulfill that purpose P2) If it’s impossible, then life is cruel and meaningless P3) If it is possible, then – not fulfilling it would make your life meaningless – and fulfilling it would also make your life meaningless (because then there would be no more point to it!) C) Therefore, if life has an ultimate purpose, then life is meaningless What Does ‘What is the Meaning of Life’ Mean? 2 So, perhaps the best way to understand this question is taking it to mean: ‘How can we make our lives meaningful?’ How Can We Make Our Lives Meaningful? 1 The answer should be objective – We should all be able to follow whatever the answer is and be able to make our lives meaningful Follow religious guidance (and make sure you pick the right one) Taylor: Simply understand that the meaning of life is to live in the manner in which it is our nature to live – The glow worm does what is in it’s nature How Can We Make Our Lives Meaningful? 2 Taylor: For humans, then, the meaning of life is living as we will to live This might make you dissatisfied with our lot, but remember – if there were a purpose for life, then life would very likely be cruel and meaningless! Taylor: So, the meaning of life comes from within us – living in accordance with our will is how we can achieve meaning in our lives What Does this Mean for Us? Taylor: So, the meaning of life comes from within us – living in accordance with our will is how we can achieve meaning in our lives We are beings-towards-a-future Our plans are the only significant thing we have – only the pursuit of them brings meaning to our lives These plans are absurdly insignificant from the outside, but not so from the inside – thank goodness! Without the subjective importance of our own plans, our lives would truly be meaningless Dealing With Doubt But, what do you do if you have a bout of feeling that life is meaningless? Watch a child play and see how the tiniest idea or object can mean so much to them And remember, the fact that your experiences feel real to you is enough to give life meaning And that the same is true of others as well So, make some plans, do something fun, or just do something that will make someone else feel good! Take-Home Lessons Don’t drop out of school or you might end up with a job like Sisyphus Don’t ever let George Bush cuddle your kitten No one likes it when you act like you are the centre of the universe With the power to wear a Spiderman costume, comes the responsibility not to do it in public The meaning of life is the same for all life Taylor: The meaning of life is the meaning that each of us continuously experiences in our lives through the act of living How to Find Out More Enroll in more philosophy courses and try to reconcile your findings about ethics, free will, time, biology, what it means to really know something, consciousness etc. And/or just think and talk about it