2 Corinthians 1:11-12

11while you join in helping us by your prayers. Then thanks will be given by many persons on our behalf for the gracious gift [of deliverance] granted to us through the prayers of many [believers].

12This is our [reason for] proud confidence: our conscience testifies that we have conducted ourselves in the world [in general], and especially toward you, with pure motives and godly sincerity, not in human wisdom, but in the grace of God [that is, His gracious lovingkindness that leads people to Christ and spiritual maturity].