To get to know a country, you must have direct contact with the earth. It's futile to gaze at the world through a car window.

Genius simply cannot be reduced to a set of rules for anyone to follow.

When the nazis came to power, I looked to the universities that prided themselves upon their intellectual freedom, and they failed me. I looked to the German press, which prided itself on the freedom of the press, and it failed me. Until at last the churches stood alone, and that for which I once had little regard earned my respect.

On the other hand, the concept owes its meaning and its justification exclusively to the totality of the sense impressions which we associate with it.

Man would indeeded be in a poor way if he had to be restrained by fear of punishment and hope of reward after death.

The pursuit of knowledge is more valuable than its possession.

Earth is the insane asylum of the universe.