I cannot understand my own behavior. I fail to carry out the things I want to do, and I find myself doing the very things I hate. When I act against my own will, … the thing behaving in that way is not my self but sin living in me.
… though the will to do what is good is in me, the performance is not, with the result that instead of doing the good things I want to do, I carry out the sinful things I do not want. When I act against my will, then, it is not my true self doing it, but sin which lives in me. … This is what makes me a prisoner of … sin…
What a wretched man I am! Who will rescue me from this body doomed to death? Thanks be to God through Jesus Christ our Lord!”
Romans 7:15-25

The worship of the one God sets man free … from the slavery of sin … CCC # 2097

“Jesus Christ … paid the price of his own sacrificial death on the cross to ransom us, to set us free from the slavery of sin, thus achieving our redemption.” CCC Glossary – Redeemer/Redemption

“The more one does what is good, the freer one becomes.” CCC # 1733

“Progress in virtue, knowledge of the good, and ascesis (intentional self discipline; practicing self control) enhance the mastery of the will over its acts.” CCC # 1734

Jesus said: “What comes out of a man is what defiles a man. For from within, out of the heart of man, come evil thoughts” (Mk 7, 14-15, 20-21).