Hypnotism is morally wrong because it is the imposition of one person's will on another person. It is also practically ineffective because its results are mostly transient and the patient relapses later into his original or even a worse state. This is because it is an attempt to cheat karma and to sidestep evolution, but the Overself of the patient will not allow that to happen. Hence hypnotism's failure, for it is an artificial attempt to do the patient's own walking for him. Every man must in the end do it for himself. The hypnotist who cures me of the drink habit leaves me just as weak-willed afterwards as I was before, nay, even more so. But if I develop my own willpower and thus cure myself of the habit I get both a permanent cure and a stronger character.
-- Notebooks Category 10: Healing of the Self > Chapter 4 : Healers of The Body and Mind > # 127