I am not a Catholic; but I consider the Christian idea, which has its roots in Greek thought and in the course of the centuries has nourished all of our European civilization, as something that one cannot renounce without becoming degraded.

Contradiction itself, far from always being a criterion of error, is sometimes a sign of truth.

Beauty captivates the flesh in order to obtain permission to pass right through to the soul. . . . When the feeling for beauty happens to be associated with the sight of some human being, the transference of love is made possible, at any rate in an illusory manner. But it is all the beauty of the world, it is universal beauty, for which we yearn.

The needs of a human being are sacred. Their satisfaction cannot be subordinated either to reasons of state, or to any consideration of money, nationality, race, or color, or to the moral or other value attributed to the human being in question, or to any consideration whatsoever.

It is a fault to wish to be understood before we have made ourselves clear to ourselves.

Two forces rule the universe: light and gravity.

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.