You cannot have a rational discussion with a man who prefers shooting you to being convinced by you.

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

There is an almost universal tendency, perhaps an inborn tendency, to suspect the good faith of a man who holds opinions that differ from our own opinions. It obviously endangers the freedom and the objectivity of our discussion if we attack a person instead of attacking an opinion or, more precisely, a theory.

Man, some modern philosophers tell us, is alienated from his world: he is a stranger and afraid in a world he never made. Perhaps he is; yet so are animals, and even plants. They too were born, long ago, into a physico-chemical world, a world they never made.

The conspiracy theory of society... comes from abandoning god and then asking: "Who is in his place"

To give a causal explanation of an event means to deduce a statement which describes it, using as premises of the deduction one or more universal laws, together with certain singular statements, the initial conditions ... We have thus two different kinds of statement, both of which are necessary ingredients of a complete causal explanation.

True ignorance is not the absence of knowledge, but the refusal to acquire it.