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.

I never heard a Christian sermon preached in a church.

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

If my father could watch my son for a while, he might realize his own immortality.

It is our knowledge - the things we are sure of - that makes the world go wrong and keeps us from seeing and learning.

It is privilege that causes evil in the world, not wickedness, and not men.

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.