Chapter 32.—When Good Will Be Perfectly Done.
The apostle then adds these words: “For I know that in me (that is, in my flesh) dwelleth no good thing: for to will is present with me; but how to perfect that which is good I find not.”114 Rom. vii. 18. Now this is said, because a good thing is not then perfected, when there is an absence of evil desires, as evil is perfected when evil desires are obeyed. But when they are present, but are not obeyed, neither evil is performed, since obedience is not yielded to them; nor good, because of their inoperative presence. There is rather an intermediate condition of things: good is effected in some degree, because the evil concupiscence has gained no assent to itself; and in some degree there is a remnant of evil, because the concupiscence is present. This accounts for the apostle’s precise words. He does not say, To do good is not present to him, but “how to perfect it.” For the truth is, one does a good deal of good when he does what the Scripture enjoins, “Go not after thy lusts;”115 Ecclus. xviii. 30. yet he falls short of perfection, in that he fails to keep the great commandment, “Thou shalt not covet.”116 Ex. xx. 7. The law said, “Thou shalt not covet,” in order that, when we find ourselves lying in this diseased state, we might seek the medicine of Grace, and by that commandment know both in what direction our endeavours should aim as we advance in our present mortal condition, and to what a height it is possible to reach in the future immortality. For unless perfection could somewhere be attained, this commandment would never have been given to us.
32. Deinde adjungit Apostolus: Scio enim quia non habitat in me, hoc est in carne mea, bonum: velle enim adjacet mihi, perficere autem bonum non invenio. Hoc ideo dictum est, quia tunc perficitur bonum, quando desideria mala nulla sunt: sicut tunc perficitur malum, quando malis desideriis obeditur. Quando autem sunt quidem, sed non eis obeditur; nec malum perficitur, quia non eis obeditur; nec bonum, quia sunt: sed fit ex aliqua parte bonum, quia concupiscentiae malae non consentitur; et ex aliqua parte remanet malum, quia vel concupiscitur. 0432 Ideo ergo Apostolus non ait facere bonum sibi non adjacere, sed perficere. Multum enim boni facit , qui facit quod scriptum est, Post concupiscentias tuas non eas (Eccli. XVIII, 30): sed non perficit, quia non implet quod scriptum est, Non concupisces (Exod. XX, 17). Ad hoc ergo dixit lex, Non concupisces, ut nos in hoc morbo invenientes jacere, medicinam gratiae quaereremus; et in eo praecepto sciremus et quo debeamus in hac mortalitate proficiendo conari, et quo possit a nobis in illa immortalitate beatissima perveniri: nisi enim quandoque perficiendum esset, nunquam jubendum esset.