Then I will tell you something. I do not believe in it. Forty years among men has consistently taught me that they are not amenable to commonsense. Show them the red tail of a comet, fill them with black terror, and they will all come running out of their houses and break their legs. But tell them one sensible proposition, and support it with seven reasons, and they will simply laugh in your face.

It is easier to rob by setting up a bank than by holding up a bank clerk.

Right is its own defense.

Righteous people have no sense of humor.

I'm in good form, taking no interest in things, neglecting clothes, meals, company, and feeling calm and stable as I write.

The human race tends to remember the abuses to which it has been subjected rather than the endearments. What's left of kisses? Wounds, however, leave scars.

Art and science work in quite different ways: agreed. But, bad as it may sound, I have to admit that I cannot get along as an artist without the use of one or two sciences. ... In my view, the great and complicated things that go on in the world cannot be adequately recognized by people who do not use every possible aid to understanding.