I never heard a Christian sermon preached in a church.

Nothing is done. Everything in the world remains to be done or done over. The greatest picture is not yet painted, the greatest play isn't written, the greatest poem is unsung. There isn't in all the world a perfect railroad, nor a good government, nor a sound law. Physics, mathematics, and especially the most advanced and exact of the sciences are being fundamentally revised. . . Psychology, economics, and sociology are awaiting a Darwin, whose work in turn is awaiting an Einstein.

My mother would thump me sharply on the head with a thimble or a spoon if I became too noisy with the whistle when I was playing I was a steamboat captain. She had no sense of the dignity of command.

I hunted far enough to suspect that the Fathers of the Republic who wrote our Sacred Constitution of the United States not only did not, but did not want to, establish a democratic government.

The best picture has not yet been painted; the greatest poem is still unsung; the mightiest novel remains to be written; the divinest music has not been conceived, even by Bach. In science, probably ninety-nine percent of the knowable has not yet been discovered.

Keep your baby eyes (which are the eyes of genius) on what we don't know

I have seen the future, and it works.