The imagination is the spur of delights. . . all depends upon it, it is the mainspring of everything; now, is it not by means of the imagination one knows joy? Is it not of the imagination that the sharpest pleasures arise?
Source: Dolmanc?, in Philosophy in the Bedroom, Dialogue the Third (1795).
-- Marquis de Sade, (Jun 2 1740-1814), French novelist; He was the author of erotic writings that gave rise to the term sadism; wrote Justine.