The sinful nature wants to do evil, which is just the opposite of what the Spirit wants. And the Spirit gives us desires that are the opposite of what the sinful nature desires. These two forces are constantly fighting each other, so you are not free to carry out your good intentions.
For the grace of God has been revealed, bringing salvation to all people. And we are instructed to turn from godless living and sinful pleasures. We should live in this evil world with wisdom, righteousness, and devotion to God.