A.T. Robertson Commentary Romans 7:20

"But if what I would not, that I do, it is no more I that do it, but sin which dwelleth in me." — Romans 7:20 (ASV)

It is no more I that do it (ουκετ εγω κατεργαζομα αυτο). Just as in verse 17, "no longer do I do it" (the real Εγο, my better self), and yet there is responsibility and guilt for the struggle goes on.