There is one common flow, one common breathing, all things are in sympathy.

Foolish the doctor who despises the knowledge acquired by the ancients.

I also maintain that clear knowledge of natural science must be acquired, in the first instance, through mastery of medicine alone.

There are, in effect, two things, to know and to believe one knows; to know is science; to believe one knows is ignorance.

Primum non nocerum. (First do no harm)

Fat people who want to reduce should take their exercise on an empty stomach and sit down to their food out of breath.... Thin people who want to get fat should do exactly the opposite and never take exercise on an empty stomach.

Many admire, few know.