" Like imperfect sleep which, instead of giving more strength to the head, doth but leave it the more exhausted, the result of mere operations of the imagination is but to weaken the soul. Instead of nourishment and energy she reaps only lassitude and disgust: whereas a genuine heavenly vision yields to her a harvest of ineffable spiritual riches, and an admirable renewal of bodily strength. I alleged these reasons to those who so often accused my visions of being the work of the enemy of mankind and the sport of my imagination…. I showed them the jewels which the divine hand had left with me:—they were my actual dispositions. "

― William James , The Varieties of Religious Experience