Why are the bones of great fishes, and oysters and corals and various other shells and sea-snails, found on the high tops of mountains that border the sea, in the same way in which they are found in the depths of the sea?

Medicine is the restoration of discordant elements; sickness is the discord of the elements infused into the living body.

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

Knowledge ... shall always bear witness like a clarion to its creator.

It had long since come to my attention that people of accomplishment rarely sat back and let things happen to them. They went out and happened to things.

The worst evil which can befall the artist is that his work should appear good in his own eyes.

He who can copy can do.