The doctrine that souls have descended from an anterior life on high may be exhibited in three forms, each animated by a different motive. The first is the view of some of the Manichean teachers, that spirits were embodied by a hostile violence and cunning, the force and fraud of the apostatized Devil. Adam and Eve were angels sent to observe the doings of Lucifer, the rebel king of matter. He seized these heavenly spies and encased them in fleshly prisons. And then, in order to preserve a permanent union of these celestial natures with matter, he contrived that their race should be propagated by the sexes. Whenever by the procreative act the germ body is prepared, a fiend hies from bale, or an angel stoops from bliss, or a demon darts from his hovering in the air, to inhabit and rule his growing clay house for a term of earthly life. The spasm of impregnation thrills in fatal summons to hell or heaven, and resistlessly drags a spirit into the appointed receptacle. Shakspeare, whose genius seems to have touched every shape of thought with adorning phrase, makes Juliet, distracted with the momentary fancy that Romeo is a murderous villain, cry, "O Nature! what hadst thou to do in hell When thou didst bower the spirit of a fiend In mortal paradise of such sweet flesh?" The second method of explaining the descent of souls into this life is by the supposition that the stable bliss, the uncontrasted peace and sameness, of the heavenly experience, at last wearies the people of Paradise, until they seek relief in a fall. The perfect sweetness of heaven cloys, the utter routine and safety tire, the salient spirits, till they long for the edge and hazard of earthly exposure, and wander down to dwell in fleshly bodies and breast the tempest of sin, strife, and sorrow, so as to give a fresh charm once more to the repose and exempted joys of the celestial realm. In this way, by a series of recurring lives below and above, novelty and change with larger experience and more vivid contentment are secured, the tedium and satiety of fixed happiness and protection are modified by the relishing opposition of varied trials of hardship and pain, the insufferable monotony of immortality broken up and interpolated by epochs of surprise and tingling dangers of probation. "Mortals, behold! the very angels quit Their mansions unsusceptible of change, Amid your dangerous bowers to sit And through your sharp vicissitudes to range!" Thus round and round we run through an eternity of lives and deaths. Surfeited with the unqualified pleasures of heaven, we "straggle down to this terrene nativity:" When, amid the sour exposures and cruel storms of the world, we have renewed our appetite for the divine ambrosia of peace and sweetness, we forsake the body and ascend to heaven; this constant recurrence illustrating the great truths, that alternation is the law of destiny, and that variety is the spice of life.