2 Corinthians 7:7-8
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7and not only by his arrival, but also by the comfort with which he was comforted among you, as he reported to us your longing, your mourning, your zeal for me; so that I rejoiced even more. 8For though I caused you sorrow by my letter, I do not regret it; though I did regret it—for I see that that letter caused you sorrow, though only for a while—