It is more important to know the person who has the condition than it is to know the condition the person has.

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

He who wishes to be a surgeon should go to war.

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.

It is most necessary to know the nature of the spine. One or more vertebrae may or may not go out of place very much and if they do, they are likely to produce serious complications and even death, if not properly adjusted. Many diseases are related to the spine.

...all the most acute, most powerful, and most deadly diseases, and those which are most difficult to be understood by the inexperienced, fall upon the brain.

And he will manage the cure best who has foreseen what is to happen from the present state of matters.