"Insomuch that we exhorted Titus, that as he made a beginning before, so he would also complete in you this grace also." And what connexion is there here? Much; and closely bearing on what went before. 'For because we saw them vehement,' he says, 'and fervent in all things, in temptations, in alms giving, in their love toward us, in the purity otherwise of their life: in order that ye too might be made their equals, we sent Titus.' Howbeit he did not say this, though he implied it. Behold excessiveness of love. 'For though intreated and desired by them,' he says, 'we were anxious about your state, lest by any means ye should come short of them. Wherefore also we sent Titus, that by this also being stirred up and put in mind, ye might emulate the Macedonians.' For Titus happened to be there when this Epistle was writing. Yet he shows that he had made a beginning in this matter before Paul's exhortation; "that as he had made a beginning before," he says. Wherefore also he bestows great praise on him; for instance, in the beginning [of the Epistle]; "Because I found not Titus my brother, I had no relief for my spirit:" and here all those things which he has said, and this too itself. For this also is no light praise, the having begun before even: for this evinces a warm and fervent spirit. Wherefore also he sent him, infusing amongst them in this also a very great incentive unto giving, the presence of Titus.
[AD 407] John Chrysostom on 2 Corinthians 8:6