Learning never exhausts the mind.

It is ordained that to the ambitious, who derive no satisfaction from the gifts of life and the beauty of the world, life shall be a cause of suffering, and they shall possess neither the profit nor the beauty of the world.

He who never puts his trust in any man will never be deceived.

I am never weary of being useful... In serving others I cannot do enough. No labor is sufficient to tire me.

In time and with water, everything changes.

A deaf and dumb person who sees two men in conversation - may nevertheless understand from the attitudes and gestures of the speakers, how well their discussion is getting along.

All our knowledge originates in opinion.