Relativity applies to physics, not ethics.

Politics is far more complicated than physics.

Now he has departed from this strange world a little ahead of me. That means nothing. People like us, who believe in physics, know that the distinction between past, present, and future is only a stubbornly persistent illusion.

The pursuit of truth and beauty is a sphere of activity in which we are permitted to remain children all our lives.

The search for truth is more precious than its possession.

The only source of knowledge is experience.

We can understand almost anything, but we can't understand how we understand.

Information is not knowledge.

The most important human endeavor is the striving for morality in our actions. Our inner balance and even our very existence depend on it. Only morality in our actions can give beauty and dignity to life.

The fear of death is the most unjustified of all fears, for there's no risk of accident for someone who's dead.