ISB ~ 2 Corinthians 10 v1

I who am humble:Opponents charged Paul with being bold at a distance but mild and even timid in their presence.

This alleged inconsistency was especially true of his discipline:they felt that his written threats were never matched with decisive action in person (1 Cor 4:18-21). Paul, however, imitates the gentleness of Christ by reserving severity and discipline as a last resort; he threatens punishment in his letters to avert the need for it when he visits (10:6; 13:2, 10).