“The mind that engages in subjects of too great variety becomes confused and weakened.”

“Patience serves as a protection against wrongs as clothes do against cold. For if you put on more clothes as the cold increases, it will have no power to hurt you. So in like manner you must grow in patience when you meet with great wrongs, and they will then be powerless to vex your mind.”

“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.”

“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”

“Learning never exhausts the mind.”

“The painter has the Universe in his mind and hands.”

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