II Corinthians 10:15-18

not boasting of things beyond measure, that is, in other men’s labors, but having hope, that as your faith is increased, we shall be greatly enlarged by you in our sphere, to preach the gospel in the regions beyond you, and not to boast in another man’s sphere of accomplishment. But “he who glories, let him glory in the LORD.” For not he who commends himself is approved, but whom the Lord commends.