Paul was surely difficult to understand even back then.I know how God see me and He does not look on my sin. In His eyes I am righteous, in my eyes I am not.
But from a human perspective it is always there. And continually nagging at me.
Romans 7:14-25 For we know that the Law is spiritual, but I am fleshly, having been sold into bondage under sin. For what I am working out, I do not understand; for I am not practicing what I would like to do, but I am doing the very thing I hate. But if I do the very thing I do not want, I agree with the Law, that it is good. So now, no longer am I the one working it out, but sin which dwells in me. For I know that nothing good dwells in me, that is, in my flesh; for the willing is present in me, but the working out of the good is not. For the good that I want, I do not do, but I practice the very evil that I do not want. But if I am doing the very thing I do not want, I am no longer the one working it out, but sin which dwells in me. I find then the principle that in me evil is present—in me who wants to do good. For I joyfully concur with the law of God in the inner man, but I see a different law in my members, waging war against the law of my mind and making me a captive to the law of sin which is in my members. Wretched man that I am! Who will deliver me from the body of this death? Thanks be to God through Jesus Christ our Lord! So then, on the one hand I myself with my mind am serving the law of God, but on the other, with my flesh the law of sin.
We can stop being totally fleshly and keep our sinful nature under control.
John Calvin spoke a lot about how depraved we are,
How the reprobate are without excuse (except of course, but for the fact the HE made them that way).
He says man is ignorant, prideful and very stubborn.
He says that most are so degenerate that in no part of the world can genuine godliness be found.
Great words to love by...
source: John Calvin's Institutes
Book 1, Chapter 3 and 4
Various paragraphs