For I delight in the law of God after the inward man:
Read Chapter 7
Paul says that the mind delights in the things which are taught by the law. This is “our inmost self,” because sin does not dwell in the mind but in the flesh…. It is prevented from dwelling in the mind by free will. Therefore sin dwells in the flesh, at the door of the soul as it were, so as to prevent the soul from doing what it wants to do. If it dwelt in the mind it would derange it, so that man would not know himself. As it is, he does know himself and takes delight in the law of God. Commentary on Paul’s Epistles. ...
See wherein we are free, wherein we are delighted with the law of God. Freedom delights. For as long as you do what is just out of fear, God does not delight you. As long as you do it still a slave, he does not delight you. Let him delight you and you are free. .
Here Paul is describing the common lot of man. For the ordinary person can see in his mind what ought to be done but cannot achieve it. But the man who has believed in Christ with his mind can achieve it with the help of the Holy Spirit. Such a person is therefore called “spiritual.” .
I am delighted with the law of God according to the inward man. As long as the inward man, or man's interior, is right, all is right.
(I perceive another law in my members, fighting, and different from the law of my mind: this is true in any man just striving against and resisting temptations, but not of the sinner, whose mind also and will consent to them. A man can never lose God's favour and grace, unless his mind and interior consent.
These hold me as it were captive in the law of sin, or sinful inclinations, but which are in the members only. I cry out, who shall deliver me from the body of this death, from this mortal body with its sinful lusts, which if consented to would bring death to the soul? Nothing but the grace of Jesus Christ can secure me from such temptations, and by freeing me from this body, can make me perfectly happy; which cannot be hoped for in this life. But I have still this greatest of consolations, that I myself, with my mind and will, still serve God, and ...
And the same is denoted by the words, "For I delight in the law of God after the inward man; but I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members. O wretched man that I am! who shall deliver me from the body of this death? " ...