What did Apostle paul mean by Sin nature Galatians 5?

As long as we are in the flesh, we will be dual-natured creatures. Paul also called this nature a "law of sin" which his mind warred against & expressed his longing for freedom from our bodies of death. Anytime I feel discouraged by the temptations that assault me & the failure to live a perfectly holy life, I just read Romans 7 & then I feel MUCH better.


I find then a law, that, when I would do good, evil is present with me. For I delight in the law of God after the inward man: But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members. O wretched man that I am! who shall deliver me from the body of this death? I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin. (Rom 7:21-25)