We have become makers of our fate when we have ceased to pose as its prophets.

I remained a socialist for several years, even after my rejection of Marxism; and if there could be such a thing as socialism combined with individual liberty, I would be a socialist still. For nothing could be better than living a modest, simple, and free life in an egalitarian society.

Piecemeal social engineering resembles physical engineering in regarding the ends as beyond the province of technology.

I have spoken to Einstein and he admitted to me that his theory was in fact no different from the one of Parmenides.

Almost everyone... seems to be quite sure that the differences between the methodologies of history and of the natural sciences are vast. For, we are assured, it is well known that in the natural sciences we start from observation and proceed by induction to theory. And is it not obvious that in history we proceed very differently? Yes, I agree that we proceed very differently. But we do so in the natural sciences as well.

Science is perhaps the only human activity in which errors are systematically criticized and, in time, corrected.

A theory that explains everything, explains nothing