"Principles to an Osteopath means a perfect plan and specification to build in form a house, an engine, a man, a world, or anything for an object or purpose. To comprehend this engine of life or man which is so constructed with all conveniences for which it was made, it is necessary to constantly keep the plan and specification before the mind, and in the mind, to such a degree that there is no lack of knowledge of the bearings and uses of all parts."

"The Osteopath seeks first physiological perfection of form, by normally adjusting the osseous frame work, so that all arteries may deliver blood to nourish and construct all parts. Also that the veins may carry away all impurities dependent upon them for renovation. Also that the nerves of all classes may be free and unobstructed while applying the powers of life and motion to all divisions, and the whole system of nature's laboratory."

Andrew Taylor Still, MD, DO,: “Principles” aus Philosophy of Osteopathy (1899)