Progress is not accomplished in one stage.

His universal compassion was due less to natural instinct, than to a profound conviction, a sum of thoughts that in the course of living had filtered through to his heart: for in the nature of man, as in rock, there may be channels hollowed by the dropping of water, and these can never be destroyed.

In this world, which is so plainly the antechamber of another, there are no happy men. The true division of humanity is between those who live in light and those who live in darkness. Our aim must be to diminish the number of the latter and increase the number of the former. That is why we demand education and knowledge.

Knowledge is a weight added to conscience.

A breath of Paris preserves the soul.

One of the hardest tasks is to extract continually from one's soul an almost inexhaustible ill will.

The clouds, - the only birds that never sleep.