Mathematics alone make us feel the limits of our intelligence. For we can always suppose in the case of an experiment that it is inexplicable because we don't happen to have all the data. In mathematics we have all the data, brought together in the full light of demonstration, and yet we don't understand. We always come back to the contemplation of our human wretchedness. What force is in relation to our will, the impenetrable opacity of mathematics is in relation to our intelligence.

Uprooting is by far the most dangerous of the ills of human society, for it perpetuates itself.

One does not play Bach without having done scales. But neither does one play a scale merely for the sake of the scale.

Because no other could do it, he himself went to the greatest possible distance, the infinite distance. This infinite distance between God and God, this supreme tearing apart, this incomparable agony, this marvel of love, is the crucifixion. Nothing can be further from God than that which has been made accursed.

One can never really give a proof of the reality of anything; reality is not something open to proof, it is something established. It is established just because proof is not enough. It is this characteristic of language, at once indispensable and inadequate, which shows the reality of the external world. Most people hardly ever realize this, because it is rare that the very same man thinks and puts his thought into action.

There are two atheisms of which one is a purification of the notion of God.

Prayer consists simply in giving to God all the careful attention of which the soul is capable.