In this section Paul reminds the church at Corinth who he is and who they are. That is, they are people who have been called by the Lord, not because of what they have done or what they have to offer the Lord, but simply because of God's grace. This section serves to ground the Corinthian believers in the gospel of grace, especially in light of Paul's rebuke of their sin and exhortation to holiness. Paul wants the believers in Corinth, and by extension, us, to understand that putting off sin and putting on holiness is only possible by God's free grace.