Beauty perishes in life, but is immortal in art.
Mechanics is the paradise of the mathematical sciences because by means of it one comes to the fruits of mathematics.
A good painter is to paint two main things, men and the working of man's mind.
One can have no more mastery over the environment, than one has over himself.
He who thinks little errs much.
A single and distinct luminous body causes stronger relief in the objects than a diffused light; as may be seen by comparing one side of a landscape illuminated by the sun, and one overshadowed by clouds, and illuminated only by the diffused light of the atmosphere.