Romans 7:16 (KJV)

For sin, taking occasion by the commandment, deceived me, and by it slew me.

Wherefore the law is holy, and the commandment holy, and just, and good.

Was then that which is good made death unto me? God forbid. But sin, that it might appear sin, working death in me by that which is good; that sin by the commandment might become exceeding sinful.

For we know that the law is spiritual: but I am carnal, sold under sin.

For that which I do I allow not: for what I would, that do I not; but what I hate, that do I.

Now then it is no more I that do it, but sin that dwelleth in me.

For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not.

For the good that I would I do not: but the evil which I would not, that I do.

Now if I do that I would not, it is no more I that do it, but sin that dwelleth in me.

I find then a law, that, when I would do good, evil is present with me.