Kill one man, and you are murderer.

We find it easy to believe that praise is sincere: why should anyone lie in telling us the truth?

I prefer the honest jargon of reality to the outright lies of books.

Theories pass. The frog remains.

To say of men that they are bad is to say they are worse than we think we are, or worse than the ideal man whose image we have built up on the basis of a certain few.

Stupidity, outrage, vanity, cruelty, iniquity, bad faith, falsehood - we fail to see the whole array when it is facing in the same direction as we.

It is not easy to imagine how little interested a scientist usually is in the work of any other, with the possible exception of the teacher who backs him or the student who honors him.