Next in importance to Lehi's doctrine of the necessity of opposite existences—good and evil, joy and sorrow, life and death—in order to the maintenance of existence at all, and the implied eternity of evil in these necessary opposite existences, is the Book of Mormon doctrine of the Fall of Man in Eden. And here, as in Lehi's doctrine of opposite existences, it will be seen that the "Mormon Book" registers another master stroke of philosophy.

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Nor is the Book of Mormon the only voice that gives utterance to this conviction of the undesirability and impossibility of life in Eden without the "Fall" and what came of it. The philosopher of Harvard, John Fiske, bears ardent testimony of the truth of it.