Christians are done with sin because Christ suffered and died for sin. With whatever time remains on earth, Christians seek to make the most of it by living for God's glory.
The Apostle Paul's mission work in Corinth serves as a case study for the principle: God's Word works. Some reject the Word, but some are brought to faith.
The Law of God shows our sin and announces the penalty for our law-breaking: death. But thanks be to God, through Jesus, he has given us victory over sin and death.