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

“Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind. So we must stretch ourselves to the very limits of human possibility. Anything less is a sin against both God and man.”

“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.”

“Obstacles cannot crush me; every obstacle yields to stern resolve.”

“A painter should begin every canvas with a wash of black, because all things in nature are dark except where exposed by the light.”

“Study without desire spoils the memory, and it retains nothing that it takes in.”

“The draperies that clothe figures must show that they are inhabited by these figures, enveloping them neatly to show the posture and motion of such figures, and avoiding the confusion of many folds, especially over the prominent parts, so that these may be evident”