Albert Barnes on 2 Corinthians 13:10

Therefore I write these things, etc. This is a kind of apology for what he had said, and especially for the apparently harsh language which he had felt himself constrained to use. He had reproved them; he had admonished them of their faults; he had threatened punishment, all of which was designed to prevent the necessity of severe measures when he should be with them.

Lest being present I should use sharpness. In order that when I come may not have occasion to employ severity. See the sentiment explained in 2Cor 10:2.

According to the power, etc. That I may not use the power with which Christ has invested me for maintaining discipline in his church. The same form of expression is found in 2Cor 10:8. 2Cor 10:8.

(c) "sharpness according" Tit 1:13 (d) "to the power" 2Cor 10:8 (+) "to destruction" "for destruction" (++) "to edification" "for edification"