Whoever in debate quotes authority uses not intellect, but memory.

Savage is he who saves himself.

Thirst will parch your tongue and your body will waste through lack of sleep ere you can describe in words that which painting instantly sets before the eye.

When you are painting you should take a flat mirror and often look at your work within it, and it will then be seen in reverse, and will appear to be by the hand of some other master, and you will be better able to judge of its faults than in any other way.

Life, when is spent well, is long.

I wish to work miracles.

Where there is shouting, there is no true knowledge.