It is not the one who commends himself who is approved, but the one whom the Lord commends

2 Corinthians 10:12-18

We do not dare to classify or compare ourselves with some who commend themselves. When they measure themselves by themselves and compare themselves with themselves, they are not wise. We, however, will not boast beyond proper limits, but will confine our boasting to the sphere of service God himself has assigned to us, a sphere that also includes you. We are not going too far in our boasting, as would be the case if we had not come to you, for we did get as far as you with the gospel of Christ. Neither do we go beyond our limits by boasting of work done by others. Our hope is that, as your faith continues to grow, our sphere of activity among you will greatly expand,  so that we can preach the gospel in the regions beyond you. For we do not want to boast about work already done in someone else’s territory.  But, “Let the one who boasts boast in the Lord.” For it is not the one who commends himself who is approved, but the one whom the Lord commends.

Their boasting counts for nothing: it is God's commendation that is all-important. Paul engages in some mock boasting of his own, tongue-in-cheek, to shame his converts and opponents. He relates the vision and revelation God has given him but says he cannot tell them what he heard or saw.

Why?

Someone will boast about what they did in the church, actually, there is nothing can boast about, even the tongue, talent or preaches. Let the one who boasts in the Lord. 

It is easy to boast when we have done something successfully. It is the grace and blessing of the Lord with us so we can do something looks successful. 

How?

Give thanks and honor to the Lord. Even in the church, we are a small part of the body of Christ. Do our best under the base of Jesus Christ.