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.

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.

First in violence, deepest in dirt, lawless, unlovely, ill-smelling, irreverent, new; an overgrown gawk of a - village, the "tough" among cities, a spectacle for the nation.

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

The doctrine of Jesus is the most revolutionary propaganda that I have ever encountered.

My father, the practical joker, did not care for practical jokes on himself; he did not encourage the practice in me.

In science, probably ninety-nine percent of the knowable has to be discovered. We know only a few streaks about astronomy. We are only beginning to imagine the force and composition of the atom. Physics has not yet found any indivisible matter, or psychology a sensible soul.