Paul's Credentials

In his second letter to the Corinthian Church, Paul asks if they need him to re-certify his credentials with them (2 Co 3). While Paul is clearly correcting the church, he also explores the idea that the church itself was his greatest set of credentials. As Christians, we are flesh and blood letters of recommendation and resumes for Christ himself. When our neighbors "read us" how does it reflect on the one who is writing our story?