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.

If you are alone you belong entirely to yourself. If you are accompanied by even one companion you belong only half to yourself or even less in proportion to the thoughtlessness of his conduct and if you have more than one companion you will fall more deeply into the same plight.

The light and heat of the universe comes from the sun, and its cold and darkness from the withdrawal of the sun.

As every divided kingdom falls, so every mind divided between many studies confounds and saps itself.

Given the cause nature produces the effect in the briefest manner that it can employ.

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

Most men are of naught more use in their lives but as machines for turning food into sh*t.