On Marriage and Concupiscence

When the first man transgressed the law of God, he began to have another law in his members which was repugnant to the law of his mind, and he felt the evil of his own disobedience when he experienced in the disobedience of his flesh a most righteous retribution recoiling on himself. Such, then, was “the opening of his eyes” which the serpent had promised him in his temptation — the knowledge, in fact, of something which he had better been ignorant of. Then, indeed, did man perceive within himself what he had done; then did he distinguish evil from good—not by avoiding it, but by enduring it.

For it certainly was not just that obedience should be rendered by his servant, that is, his body, to him, who had not obeyed his own Lord. Well, then, how significant is the fact that the eyes, and lips, and tongue, and hands, and feet, and the bending of back, and neck, and sides, are all placed within our power— to be applied to such operations as are suitable to them, when we have a body free from impediments and in a sound state of health; but when it must come to man's great function of the procreation of children the members which were expressly created for this purpose will not obey the direction of the will, but lust has to be waited for to set these members in motion, as if it had legal right over them, and sometimes it refuses to act when the mind wills, while often it acts against its will!

Must not this bring the blush of shame over the freedom of the human will, that by its contempt of God, its own Commander, it has lost all proper command for itself over its own members? Now, wherein could be found a more fitting demonstration of the just depravation of human nature by reason of its disobedience, than in the disobedience of those parts whence nature herself derives subsistence by succession? For it is by a special propriety that those parts of the body are designated as natural.

This, then, was the reason why the first human pair, on experiencing in the flesh that motion which was indecent because disobedient, and on feeling the shame of their nakedness, covered these offending members with fig-leaves; in order that, at the very least, by the will of the ashamed offenders, a veil might be thrown over that which was put into motion without the will of those who wished it: and since shame arose from what indecently pleased, decency might be attained by concealment.