"The wise man does not grieve for what he has not, but rejoices in what he has."

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

"The physician must be a man of wisdom, for wisdom is the foundation of medicine."

"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."