People of higher talent work, even if they seem to do nothing

Great love is born of great knowledge of the thing that is loved, and if you do not know it, you can love it little or not at all.

Let not your rage or malice destroy a life.

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.

The desire to know is natural to good men.

Painting is concerned with the ten things you can see: these are darkness and brightness, substance and color, form and place, remoteness and nearness, movement and rest.

There is no result in nature without a cause; understand the cause and you will have no need of the experiment.