There is only one good, knowledge, and one evil, ignorance.

The more I see, the less I know for sure.

One can have no smaller or greater mastery than mastery of oneself.

Time stays long enough for anyone who will use it.

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.

Art is never finished, only abandoned.

I have been impressed with the urgency of doing. Knowing is not enough, we must apply. Being willing is not enough, we must do.

Why does the eye see a thing more clearly in dreams than the imagination when awake?