Wellspring n. A fountain; a spring; a source of continual supply. "Understanding is a wellspring of life unto him that hath it; but the instruction of fools is folly."
... at her window view, more astonished than anything else at this sudden rise of passion in the drummer. She could hardly believe her senses—so good-natured and tractable had he invariably been. It was not for her to see the wellspring of human passion. A real flame of love is a subtle thing. It burns as a will-o'-the-wisp, dancing onward to fairylands of delight. It roars as a furnace. Too often jealousy is the quality ... — Sister Carrie • Theodore Dreiser
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