The awareness of the ambiguity of one's highest achievements, as well as one's deepest failures is a definite symptom of maturity.

Out of the element of participation follows the certainty of faith; out of the element of separation follows the doubt in faith. And each is essential for the nature of faith. Sometimes certainty conquers doubt, but it cannot eliminate doubt. The conquered of today may become the conqueror of tomorrow. Sometimes doubt conquers faith, but it still contains faith. Otherwise it would be indifference.

Being human means asking the questions of one's own being and living under the impact of the answers given to this question. And, conversely, being human means receiving answers to the questions of one's own being and asking questions under the impact of the answers.

Faith is an act of a finite being who is grasped by, and turned to, the infinite.

In the depth of the anxiety of having to die is the anxiety of being eternally forgotten.

Culture (science) is the form of religion; Religion is the substance of culture (science).

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