It is harder to crack prejudice than an atom.

Student: Dr. Einstein, Aren't these the same questions as last year's [physics] final exam?

Dr. Einstein: Yes; But this year the answers are different.

Never memorize something that you can look up.

Gandhi, the greatest political genius of our time, has pointed the way. He was shown of what sacrifices people are capable once they have found the right way. His work for the liberation of India is a living testimony to the fact that a will governed by firm conviction is stronger than a seemingly invincible material power.

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.