15 For I do not understand my own actions [I am baffled, bewildered]. I do not practice or accomplish what I wish, but I do the very thing that I loathe [which my moral instinct condemns].
16 Now if I do [habitually] what is contrary to my desire, [that means that] I acknowledge and agree that the Law is good (morally excellent) and that I take sides with it.
17 However, it is no longer I who do the deed, but the sin [principle] which is at home in me and has possession of me.
18 For I know that nothing good dwells within me, that is, in my flesh. I can will what is right, but I cannot perform it. [I have the intention and urge to do what is right, but no power to carry it out.]
19 For I fail to practice the good deeds I desire to do, but the evil deeds that I do not desire to do are what I am [ever] doing.
20 Now if I do what I do not desire to do, it is no longer I doing it [it is not myself that acts], but the sin [principle] which dwells within me [fixed and operating in my soul].
21 So I find it to be a law (rule of action of my being) that when I want to do what is right and good, evil is ever present with me and I am subject to its insistent demands.