This need for the conversion or remaking of the instinctive life, rather than the achievement of mere beliefs, has always been appreciated by real spiritual teachers; who are usually some generations in advance of the psychologists. Here they agree in finding the "root of evil," the heart of the "old man" and best promise of the "new." Here is the raw material both of vice and of virtue--namely, a mass of desires and cravings which are in themselves neither moral nor immoral, but natural and self-regarding. "In will, imagination and desire," says William Law, "consists the life or fiery driving of every intelligent creature."[70] The Divine voice which said to Jacopone da Todi "Set love in order, thou that lovest Me!" declared the one law of mental growth.[71] To use for a moment the language of mystical theology, conversion, or repentance, the first step towards the spiritual life, consists in a change in the direction of these cravings and desires; purgation or purification, in which the work begun in conversion is made complete, in their steadfast setting in order or re-education, and that refinement and fixation of the most desirable among them which we call the formation of habit, and which is the essence of character building. It is from this hard, conscious and deliberate work of adapting our psychic energy to new and higher correspondences, this costly moral effort and true self-conquest, that the spiritual life in man draws its earnestness, reality and worth. "Oh, Academicus," says William Law, in terms that any psychologist would endorse, "forget your scholarship, give up your art and criticism, be a plain man; and then the first rudiments of sense may teach you that there, and there only, can goodness be, where it comes forth as a birth of Life, and is the free natural work and fruit of that which lives within us. For till goodness thus comes from a Life within us, we have in truth none at all. For reason, with all its doctrine, discipline, and rules, can only help us to be so good, so changed, and amended, as a wild beast may be, that by restraints and methods is taught to put on a sort of tameness, though its wild nature is all the time only restrained, and in a readiness to break forth again as occasion shall offer."[72] Our business, then, is not to restrain, but to put the wild beast to work, and use its mighty energies; for thus only shall we find the power to perform hard acts. See the young Salvation Army convert turning over the lust for drink or sexual satisfaction to the lust to save his fellow-men. This transformation or sublimation is not the work of reason. His instinctive life, the main source of conduct, has been directed into a fresh channel of use.