A person starts to live when he can live outside himself.

One should respect an honest person even if he expresses opinions differing from one's own.

What a sad era when it is easier to smash an atom than a prejudice.

Our separation from each other is an optical illusion.

It would seem that men always need some idiotic fiction in the name of which they can hate one another. Once it was religion. Now it is the State.

Concern for man and his fate must always form the chief interest of all technical endeavors. Never forget this in the midst of your diagrams and equations.

At present every coachman and every waiter argues about whether or not the relativity theory is correct.