"According to the most influential twentieth-century philosopher of science, Karl Popper, a theory is scientific only in so far as it is falsifiable, and should be given up as soon as it has been falsified. By this standard, the theories of Darwin and Einstein should never have been accepted."

“Science is not distinguished from myth by science being literally true and myth only a type of poetic analogy. While their aims are different, both are composed of symbols we use to deal with a slippery world.”

“The belief in unity that has fuelled so many utopian dreams is an effort to reconcile the irreconcilable that ends in repression. Berlin suggests we renounce this venerable faith, and learn how to live with intractable conflict.”

“Human knowledge increases, while human irrationality stays the same. Scientific inquiry may be an embodiment of reason, but what such inquiry demonstrates is that humans are not rational animals. The fact that humanists refuse to accept the demonstration only confirms its truth.”

“Freud taught that for any human being kindness or cruelty, having a sense of justice or lacking it, depend on the accidents of childhood. We all know this to be true, but it goes against much of what we say we believe. We cannot give up the pretence that being good is something anyone can achieve. If we did, we would have to admit that, like beauty and intelligence, goodness is a gift of fortune. We would have to accept that, in the parts of our lives where we are most attached to it, freedom of the will is an illusion.”

“Action preserves a sense of self-identity that reflection dispels. When we are at work in the world we have a seeming solidity. Action gives us consolation for our inexistence. It is not the idle dreamer who escapes from reality. It is practical men and women, who turn to a life of action as a refuge from insignificance.”

“Gamblers wager for the sake of playing. Among those who fish for pleasure, the best fisherman is not the one who catches the most fish but the one who enjoys fishing the most. The point of playing is that the play has no point.”