A.T. Robertson Commentary Romans 7:19

"For the good which I would I do not: but the evil which I would not, that I practise." — Romans 7:19 (ASV)

But the evil which I would not (αλλα ο ου θελω κακον). Incorporation of the antecedent into the relative clause, "what evil I do not wish." An extreme case of this practise of evil is seen in the drunkard or the dope-fiend.