When an apprentice gets hurt, or complains of being tired, the workmen and peasants have this fine expression: "It is the trade entering his body." Each time that we have some pain to go through, we can say to ourselves quite truly that it is the universe, the order and beauty of the world, and the obedience of God that are entering our body.

Someone who does not see a pane of glass is not aware of not seeing it.

To claim that theft or adultery or lying are "evil" simply reflects our degraded idea of good-—that it has something to do with respect for property, respectability, and sincerity.

Never react to an evil in such a way as to augment it.

To get power over is to defile. To possess is to defile.

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.

It is an eternal obligation toward the human being not to let him suffer from hunger when one has a chance of coming to his assistance.