“Throughout the entire history of philosophy, philosophers have sought to discover what man is - or what human nature is. But Sartre believed that man has no such eternal nature to fall back on. It is therefore useless to search for the meaning of life in general. We are condemned to improvise. We are like actors dragged onto the stage without having learned our lines, with no script and no prompter to whisper stage directions to us. We must decide for ourselves how to live.”

“Nevertheless we are free individuals, and this freedom condemns us to make choices throughout our lives. There are no eternal values or norms we can adhere to, which makes our choices even more significant. Because we are totally responsible for everything we do. Sartre emphasized that man must never disclaim the responsibility for his actions. Nor can we avoid the responsibility of making our own choices on the grounds that we "must" go to work, or we "must" live up to certain middle-class expectations regarding how we should live. Those who thus slip into the anonymous masses will never be other than members of the impersonal flock, having fled from themselves into self-deception. On the other hand our freedom obliges us to make something of ourselves, to live "authentically" or "truly".”

“Hume emphasized that the expectation of one thing following another does not lie in the things themselves, but in our mind. And expectation, as we have seen, is associated with habit. Going back to the child again, it would not have stared in amazement if when one billiard ball struck the other, both had remained perfectly motionless. When we speak of the 'laws of nature' or of 'cause and effect,' we are actually speaking of what we expect, rather than what is 'reasonable.' The laws of nature are neither reasonable nor unreasonable, they simply are. The expectation that the white billiard ball will move when it is struck by the black billiard ball is therefore not innate. We are not born with a set of expectations as to what the world is like or how things in the world behave. The world is like it is, and it's something we get to know”

“Hegel believed that the basis of human cognition changed from one generation to the next. There were therefore no 'eternal truths', no timeless reason. The only fixed point philosophy can hold on to is history itself.”

“let's say you and a small child go to a magic show, where things are made to float in the air. Which of you would have the most fun?""I probably would.""And why would that be?""Because I would know how impossible it all is.""So... for the child it's no fun to see the laws of nature being defied before it has learned what they are.""I guess that's right.""And we are still at the crux of Hume's philosophy of experience. He would have added that the child has not yet become a slave of the expectations of habit; he is thus the more open-minded of you two. I wonder if the child is not also the greater philosopher? He comes utterly without preconceived opinions. And that, my dear Sophie, is the philosopher's most distinguishing virtue. The child perceives the world as it is, without putting more into things than he experiences”

“It is by no means certain that we advance our philosophical quest by reading Plato or Aristotle. It may increase our knowledge of history but not of the world.”

“When we gaze at a star in the Milky Way which is 50,000 light-years away from our sun, we are looking back 50,000 years in time.""The idea is much too big for my little head.""The only way we can look out into space, then, is to look back in time. We can never know what the universe is like now. We only know what it was like then. When we look up at a star that is thousands of light-years away, we are really traveling thousands of years back in the history of space.”