Absolutely unmixed attention is prayer.

A self-respecting nation is ready for anything, including war, except for a renunciation of its option to make war.

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.

The only great spirit of our time.

Absolutely unmixed attention is prayer.

Evil is neither suffering nor sin; it is both at the same time, it is something common to them both. For they are linked together; sin makes us suffer and suffering makes us evil, and this indissoluble complex of suffering and sin is the evil in which we are submerged against our will, and to our horror.

There are only two things that pierce the human heart. One is beauty. The other is affliction.