The reading is from St. Paul's Second Letter to the Corinthians 7:1-10

Brethren, let us cleanse ourselves from every defilement of body and spirit, and make holiness perfect in the fear of God.

Open your hearts to us; we have wronged no one, we have corrupted no one, we have taken advantage of no one. I do not say this to condemn you, for I said before that you are in our hearts, to die together and to live together. I have great confidence in you; I have great pride in you; I am filled with comfort. With all our affliction, I am overjoyed.

For even when we came into Macedonia, our bodies had no rest but we were afflicted at every turn --fighting without and fear within. But God, who comforts the downcast, comforted us by the coming of Titus, and not only by his coming but also by the comfort with which he was comforted in you, as he told us of your longing, your mourning, your zeal for me, so that I rejoiced still more. For even if I made you sorry with my letter, I do not regret it (though I did regret it), for I see that that letter grieved you, though only for a while. As it is, I rejoice, not because you were grieved, but because you were grieved into repenting; for you felt a godly grief, so that you suffered no loss through us. For godly grief produces a repentance that leads to salvation and brings no regret, but worldly grief produces death.