2 Corinthians 8:6-8

Accordingly, we urged Titus that as he had started, so he should complete among you this act of grace. But as you excel in everything—in faith, in speech, in knowledge, in all earnestness, and in our love for you—see that you excel in this act of grace also. I say this not as a command, but to prove by the earnestness of others that your love also is genuine.