Our belief in any particular natural law cannot have a safer basis than our unsuccessful critical attempts to refute it.

The best thing that can happen to a human being us to find a problem, to fall in love with that problem, and to live trying to solve that problem, unless another problem even more lovable appears.

Optimism is a duty. The future is open. It is not predetermined. No one can predict it, except by chance. We all contribute to determining it by what we do. We are all equally responsible for its success.

The only way to test a hypothesis is to look for all the information that disagrees with it.

The moral decisions of others should be treated with respect, as long as such decisions do not conflict with the principle of tolerance.

My thesis is that what we call 'science' is differentiated from the older myths not by being something distinct from a myth, but by being accompanied by a second-order tradition-that of critically discussing the myth. ... In a certain sense, science is myth-making just as religion is.

The quest for precision is analogous to the quest for certainty and both - precision and certainty are impossible to attain.