Proverbs 30:15

Who can hide from himself what is thus enigmatically expressed? "The horseleech had three daughters, dearly loved, but they satisfied her not, and a fourth is not satisfied when you say Enough: the grave, and woman's love, and the earth that is not satisfied with water, and the fire that does not say Enough." The horseleech is the devil, the daughters of the devil are dearly loved, and they cannot be satisfied with the blood of the slain: "the grave, and woman's love, and the earth dry and scorched with heat." It is not the harlot or the adulteress who is spoken of, but woman's love in general is accused of ever being insatiable. Put it out, it bursts into flame; give it plenty, it is again in need. It enervates a man's mind and engrosses all thought except for the passion which it feeds.

The leech has two daughters, etc. The leech is the devil, who is incessantly inflamed with the thirst for sinning and persuading to sin. He has two daughters because there are two special allurements of the human race; they imitate the ardor of this ancient enemy, namely lust and avarice. For lust, the more its reins are loosened, the more noxious it becomes; and as one of the poets says, The love of money grows as much as the money itself grows. There are three insatiable things, etc. Fire does not say, It is enough; hell never overflows: similarly the nearby harlot, her body is not satisfied with delights; and the greedy man never says, It is enough. Some interpret hell as the devil, because he is insatiable in the seduction of humans. The mouth of the womb and the land, which are not satisfied with water, as above; fire that does not say, It is enough: the fire of hell, which never ceases, but with infinite ardor burns those who did not want to put an end to their sins.

As to the horse-leech. There were three daughters fondly loved by sin-fornication, murder, and idolatry. These three did not satisfy her, for she is not to be satisfied. In destroying man by these actions, sin never varies, but only grows continually. For the fourth, he continues, is never content to say "enough," meaning that it is universal lust. In naming the "fourth," he intends lust in the universal. For as the body is one, and yet has many members; so also sin, being one, contains within it many various lusts by which it lays its snares for men. Wherefore, in order to teach us this, he uses the examples of Sheol (Hades), and the love of women, and hell (Tartarus), and the earth that is not filled with water. And water and fire, indeed, will never say, "It is enough." And the grave (Hades) in no wise ceases to receive the souls of unrighteous men; nor does the love of sin, in the instance of the love of women, cease to be given to fornication, and it becomes the betrayer of the soul. And as Tartarus, which is situated in a doleful and dark locality, is not touched by a ray of light, so is every one who is the slave of sin in all the passions of the flesh Like the earth not filled with water he is never able to come to confession, and to the laver of regeneration, and like water and fire, never says, "It is enough."