The physician must be able to tell the antecedents, know the present, and foretell the future — must mediate these things, and have two special objects in view with regard to disease, namely, to do good or to do no harm.

Men ought to know that from nothing else but the brain come joys, delights, laughter and sports, and sorrows, griefs, despondency, and lamentations. And by this, in an especial manner, we acquire wisdom and knowledge, and see and hear and know what are foul and what are fair, what are bad and what are good, what are sweet and what are unsavory…. And by the same organ we become mad and delirious, and fears and terrors assail us….All these things we endure from the brain when it is not healthy….In these ways I am of the opinion that the brain exercises the greatest power in the man.

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

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

Sometimes give your services for nothing.

That which is used - develops. That which is not used wastes away.

Eunuchs do not take the gout, nor become bald.