21 Once more He urges us to investigate the matter somewhat more exactly concerning these five husbands. Many have in fact understood, not indeed absurdly, nor so far improbably, the five husbands of this woman to mean the five books of Moses. For the Samaritans' made use of these books, and were under the same law: for it was from it they had circumcision. But since we are hemmed in by what follows, “And he whom you now have is not your husband,” it appears to me that we can more easily take the five senses of the body to be the five former husbands of the soul.
For when one is born, before he can make use of the mind and reason, he is ruled only by the senses of the flesh. In a little child, the soul seeks for or shuns what is heard, and seen, and smells, and tastes, and is perceived by the touch. It seeks for whatever soothes, and shuns whatever offends, those five senses. At first, the soul lives according to these five senses, as five husbands; because it is ruled by them. But why are they called husbands? Because they are lawful and right: made indeed by God, and are the gifts of God to the soul.
The soul is still weak while ruled by these five husbands, and living under these five husbands; but when she comes to years of exercising reason, if she is taken in hand by the noble discipline and teaching of wisdom, these five men are succeeded in their rule by no other than the true and lawful husband, and one better than they, who both rules better and rules for eternity, who cultivates and instructs her for eternity. For the five senses rule us, not for eternity, but for those temporal things that are to be sought or shunned.
But when the understanding, imbued by wisdom, begins to rule the soul, it knows now not only how to avoid a pit, and to walk on even ground— a thing which the eyes show to the soul even in its weakness; nor merely to be charmed with musical voices, and to repel harsh sounds; nor to delight in agreeable scents, and to refuse offensive smells; nor to be captivated by sweetness, and displeased with bitterness; nor to be soothed with what is soft, and hurt with what is rough. For all these things are necessary to the soul in its weakness.
Then what rule is made use of by that understanding? Not one to discern between black and white, but between just and unjust, between good and evil, between the profitable and the unprofitable, between chastity and impurity, that it may love the one and avoid the other; between charity and hatred, to be in the one, not to be in the other.
Source: Tractates on the Gospel of John (New Advent)