For, etc. - better, “For I know that there dwelleth not in me, that is in my flesh, any good.”
for to will - “desire.”
is present with me; but how to perform that which is good - the supplement “how,” in our version, weakens the statement.
I find not - Here, again, we have the double self of the renewed man; “In me dwelleth no good; but this corrupt self is not my true self; it is but sin dwelling in my real self, as a renewed man.”