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

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

Time stays long enough for anyone who will use it.

Wisdom is the daughter of experience.

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

Art is never finished, only abandoned.

My brain is only a receiver, in the Universe there is a core from which we obtain knowledge, strength and inspiration. I have not penetrated into the secrets of this core, but I know that it exists.

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

The noblest pleasure is the joy of understanding.