A careful study will elicit the fact that although all these various systems differ in their tenets of belief, they have several similarities of technique. A scientific examination of these similarities will yield the basis for determining the universally correct tenet of belief. Such an examination is necessary because the systems themselves have not sufficient interest in a scientific approach to make it themselves and are too self-interested to check their alleged cures with sufficient care. Even were they truly independent intellectually--which they are not--they are usually tied up to some form of religious creed. All these systems are dogmatic ones, being mostly based on some personal revelation. They depend primarily on faith. The treatments include very much more than faith alone.
-- Notebooks Category 10: Healing of the Self > Chapter 4 : Healers of The Body and Mind > # 15
