Perspective is a most subtle discovery in mathematical studies, for by means of lines it causes to appear distant that which is near, and large that which is small.

A good painter has two main objects to paint, man and the intention of his soul.

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

Principles for the Development of a Complete Mind: Study the science of art. Study the art of science. Develop your senses- especially learn how to see. Realize that everything connects to everything else.

Learning is the only thing the mind never exhausts, never fears, and never regrets.

Medicine is the restoration of discordant elements.

Wisdom is the daughter of experience