William Burkitt on 2 Corinthians 7:13

That is, in all the forementioned effects and fruits, signs and evidences of a true repentance, which were found in you, and are matter of great comfort to you, we are also comforted with you; and we also had a superadded joy, for the joy that Titus conceived, upon his understanding of your affairs; also your ready compliance with the duties and directions given you in my former epistle, did wonderfully refresh and rejoice his spirit; and in all these your consolations and comforts am I comforted.

Hence learn, That such is the intimate and endeared union between the ministers and members of Jesus Christ, that they are comforted with one another's comforts, and afflicted with each other's sorrows and sufferings.