Romans 7:17-18

Now then it is no more I that do it: To will good is present with me. These expressions all shew that he speaks of temptations that affect the sense only, the imagination, or the members of the body, but to which the mind and the will give no consent, but retain an aversion to them; and so long they never can be truly and properly sins, which must be with full deliberation and consent. (Witham) --- The apostle here means to say, that he knew by experience that evil and not good dwelt within him, according to the flesh. He does not contradict this passage when he says elsewhere, that our members are the temples of the Holy Ghost: (1 Corinthians iii. 6. &c.) for good cannot be found in our flesh, inasmuch as it is corrupted by sin;; whence our Saviour says, "What is born of flesh, is flesh." (John iii.) But good is in our body, when our members under the influence of the soul, renewed by the Holy Ghost residing in it, are employed in good works. The meaning of this passage is, that although now healed and renewed by grace, he could have a perfect desire of doing good; yet still on account of the evil of concupiscence dwelling in his flesh, he found not himself able to perform all the good he wished, because concupiscence was always urging him on to evil against his will. (Estius)