Rancor is an outpouring of a feeling of inferiority.

The metaphor is probably the most fertile power possessed by man

The man who discovers a new scientific truth has previously had to smash to atoms almost everything he had learnt, and arrives at the new truth with hands blood stained from the slaughter of a thousand platitudes.

I am I plus my surroundings; and if I do not preserve the latter, I do not preserve myself.

One age cannot be completely understood if all the others are not understood. The song of history can only be sung as a whole.

Love is exclusivity, selection.

Love is that splendid triggering of human vitality the supreme activity which nature affords anyone for going out of himself toward someone else.