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

"Leeches should be kept a day before applying them. They should be squeezed to make them eject the contents of their stomachs."

"An ignorant doctor is the aide-de-camp of death."

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

"The best way to keep the body healthy is to keep the mind healthy."