Eunuchs do not take the gout, nor become bald.

It is changes that are chiefly responsible for diseases, especially the greatest changes, the violent alterations both in the seasons and in other things. (:)...regimen and temperature, and one period of life to another.

We must turn to nature itself, to the observations of the body in health and in disease to learn the truth.

To do nothing is sometimes a good remedy.

All parts of the body which have a function, if used in moderation and exercised in labors in which each is accustomed, become thereby healthy, well developed and age more slowly, but if unused they become liable to disease, defective in growth and age quickly.

Where prayer, amulets and incantations work it is only a manifestation of the patient's belief.

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