Doubt is not the opposite of faith; it is one element of faith.

The first duty of love is to listen.

We can speak without voice to the trees and the clouds and the waves of the sea. Without words they respond through the rustling of leaves and the moving of clouds and the murmuring of the sea.

But freedom is the possibility of a total and centered act of the personality, an act in which all the drives and influences which constitute the destiny of man are brought into the centered unity of a decision.

The basic anxiety, the anxiety of a finite being about the threat of non-being, cannot be eliminated. It belongs to existence itself.

Cynically speaking, one could say that it is true to life to be cynical about it.

The fatal pedagogical error is to throw answers like stones at the heads of those who have not yet asked the questions.