How about Pithecanthropus Erectus? Was it really he who ate the apple? Or was it Homo Pekiniensis?

Thought is subversive and revolutionary, destructive and terrible, Thought is merciless to privilege, established institutions, and comfortable habit. Thought is great and swift and free.

There may be no good reasons for very many opinions that are held with passion.

What is wanted is not the will to believe, but the will to find out, which is the exact opposite.

One of the chief obstacles to intelligence is credulity, and credulity could be enormously diminished by instructions as to the prevalent forms of mendacity.

More important than the curriculum is the question of the methods of teaching and the spirit in which the teaching is given

To the young I should offer two maxims: Don't accept superficial solutions of difficult problems. It is better to do a little good than much harm. I should not offer anything more specific; every young person should decide on his or her own credo.