Having these promises, Paul urges them to cleanse themselves from every defilement of body and spirit, bringing holiness to completion in the fear of God. He asks them to make room for him in their hearts: they have wronged no one, corrupted no one, taken advantage of no one. He does not say it to condemn them, for he has said they are in his heart to die together and to live together. He has great confidence in them, he is filled with comfort and overflowing with joy in all his affliction.
He tells how, when he came to Macedonia, he had no rest but was afflicted at every turn: fighting without and fear within. But God, who comforts the downcast, comforted him by the coming of Titus, and not only by his coming but by the comfort with which Titus had been comforted by them, as he told of their longing, their mourning and their zeal for Paul, so that Paul rejoiced still more.
Paul does not regret having grieved them with his letter. Though he regretted it at first, now he rejoices, not because they were grieved, but because they were grieved into repenting. Godly grief produces a repentance that leads to salvation without regret, but worldly grief produces death. That grief produced in them earnestness, indignation, fear, longing, zeal and readiness to set wrong right, and in everything they showed themselves innocent in the matter.
Paul explains that he wrote so that their earnest care for them might be revealed in the sight of God. That is why he was comforted, and rejoiced still more at the joy of Titus, whose spirit was refreshed by them all. If he had boasted about them to Titus, he was not put to shame: his boasting proved true. Titus remembers them with affection for their obedience and for how they received him. Paul ends by rejoicing that he can have complete confidence in them.