"The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes."

"The human intellect is incapable of knowing the divine essence."

"O what a lean cow! it is not fit to be killed: give it fodder until it gets fat."

"The physician must be a man of courage, for courage is necessary in the face of death."

"A man’s worth is determined by his knowledge."