Sexual Desire

One of the principles, coming under the denomination of the Appetites, is that, which results from the relation of the sexes. A serious mind, certainly, one that is disposed to recognize the benevolent hand of God in all his works, will not be inclined to speak in terms of disparagement of this appetite, which, in an important sense, is the foundation of the family state. But sin, which has spread its poison every where, has converted that, which was designed for good, and nothing but good, into a source of evil. Every desire, founded upon the relation of the sexes, which is not in accordance with the providence and the will of God, leaves a stain upon the mind's purity, and is at war with holiness. But it is necessary merely to allude to the dangers from this source. The holy mind, which appreciates the importance of watchfulness in every direction, will not be inattentive to the perplexities and hazards which exist here. A single emotion, at variance with entire purity of heart, is inconsistent, so long as it exists, with communion with God, and with his favor.

— The Interior or Hidden Life (1844) Part 2, Chapter 3.