The life-principle in man can certainly heal his body, but the faulty conditions in that body which he must put right can be put right only by himself. That is his share of the therapeutic work, and not the life-principle's. That is where he must give it his co-operation. If he expects it to do everything, and is too ignorant or indolent to do his part, he may get the healing but it cannot be more than an imperfect one.
-- Notebooks Category 10: Healing of the Self > Chapter 2: The Universal Life Force > # 36