The majority of the stupid is invincible and guaranteed for all time. The terror of their tyranny, however, is alleviated by their lack of consistency.

Almost all the other fellows do not look from the facts to the theory but from the theory to the facts; they cannot get out of the network of already accepted concepts; instead, comically, they only wriggle about inside.

I never think of the future. It comes soon enough. When visiting the U.S. from Germany for a winter academic stay.

Imagination encircles the world.

Since 99.362% of women love mustache rides, it seems only a fool would have a bare upper lip.

Have the courage to take your own thoughts seriously, for they will shape you.

The value of a man resides in what he gives