“Passion excites, earthly wisdom cools, but neither this heat nor this coolness, nor the blending of the heat and coolness is the pure air of the eternal. There is in this heat something ardent, and in this coolness something sharp, and in the blending of the two something indefinite, or an unconscious deceitfulness, as in the hazardous season of spring. But this ‘thou shalt love’ takes away all the unsoundness and preserves the soundness of eternity.”