“You can never know if a person forgives you when you wrong them. Therefore it is existentially important to you. It is a question you are intensely concerned with. Neither can you know whether a person loves you. It’s something you just have to believe or hope. But these things are more important to you than the fact that the sum of the angles in a triangle is 180 degrees. You don't think about the law of cause and effect or about modes of perception when you are in the middle of your first kiss.”

“Imagine that you were on the threshold of this fairytale, sometime billions of years ago when everything was created. And you were able to choose whether you wanted to be born to a life on this planet at some point. You wouldn’t know when you were going to be born, nor how long you’d live for, but at any event it wouldn’t be more than a few years. All you’d know was that, if you chose to come into the world at some point, you’d also have to leave it again one day and go away from everything. This might cause you a good deal of grief, as lots of people think that life in the great fairytale is so wonderful that the mere thought of it ending can bring tears to their eyes. Things can be so nice here that it’s terribly painful to think that at some point the days will run out. What would you have chosen, if there had been some higher power that had gave you the choice? Perhaps we can imagine some sort of cosmic fairy in this great, strange fairytale. What you have chosen to live a life on earth at some point, whether short or long, in a hundred thousand or a hundred million years? Or would you have refused to join in the game because you didn’t like the rules? (...) I asked myself the same question maybe times during the past few weeks. Would I have elected to live a life on earth in the firm knowledge that I’d suddenly be torn away from it, and perhaps in the middle of intoxicating happiness? (...) Well, I wasn’t sure what I would have chosen. (...) If I’d chosen never to the foot inside the great fairytale, I’d never have known what I’ve lost. Do you see what I’m getting at? Sometimes it’s worse for us human beings to lose something dear to us than never to have had it at all.”

“Imagine that one day you are out for a walk in the woods. Suddenly you see a small spaceship on the path in front of you. A tiny Martian climbs out the spaceship and stands on the ground looking up at you…What would you think? Never mind, it’s not important. But have you ever given any thought to the fact that you are a Martian yourself?It is obviously unlikely that you will ever stumble upon a creature from another planet. We do not even know that there is life on other planets. But you might stumble upon yourself one day. You might suddenly stop short and see yourself in a completely new light. On just such a walk in the woods. I am an extraordinary being, you think. I am a mysterious creature.You feel as if you are waking from an enchanted slumber. Who am I? you ask. You know that you are stumbling around on a planet in the universe. But what is the universe?If you discover yourself in this manner you will have discovered something as mysterious as the Martian we just mentioned. You will not only have seen a being from outer space. You will feel deep down that you are yourself an extraordinary being.”

“When you realize there is something you don't understand, then you're generally on the right path to understanding all kinds of things.”

“I'm more concerned, just as you used to be, with the world as a riddle than with the riddles in the world. I'm more concerned with natural than the supernatural. And I feel more wonder for our inscrutable brain than for all these loose anecdots about the 'extrasensory'.”

“The history of thought - or of reason - is like this river. The thoughts that are washed along with the current of past tradition, as well as the material conditions prevailing at the time, help to determine how you think. You can therefore never claim that any particular thought is correct for ever and ever. But the thought can be correct from where you stand.”

“Socrates himself said, 'One thing only I know, and this is that I know nothing.' Remember this statement, because it is an admission that is rare, even among philosophers. Moreover, it can be so dangerous to say in public that it can cost you your life. The most subversive people are those who ask questions. Giving answers is not nearly as threatening. Any one question can be more explosive than a thousand answers.”