2 Corinthians 10:11-13
11 They need to understand this: whatever we say through our letters when we are away, that is exactly what we will do when we are looking you in the eye.
12 For we would never dare to compare ourselves with people who have based their worth on self-commendation. They check themselves against and compare themselves with one another. It just shows that they don’t have any sense! 13 So we will carefully limit our boasting to the extent only of what God has done in and through us, a reach that extends as far as you.Read full chapter