Three deep cravings of the self, three great expressions of man's restlessness, which only mystic truth can fully satisfy. The first is the craving which makes him a pilgrim and a wanderer. It is the longing to go out from his normal world in search of a lost home, a "better country"; an Eldorado, a Sarras, a Heavenly Syon. The next is the craving of heart for heart, of the Soul for its perfect mate, which makes him a lover. The third is the craving for inward purity and perfection, which makes him an ascetic, and in the last resort, a saint.
~ Evelyn Underhill, in a forward to Green Dolphin Street by Elizabeth Goudge