GRACE 2 Corinthians 1:12

Now this is our boast: Our conscience testifies that we have conducted ourselves in the world, and especially in our relations with you, with integrity and godly sincerity. We have done so, relying not on worldly wisdom but on God's grace. 

Our conscience testifies 
Acts 23:1  Paul looked straight at the Sanhedrin and said, "My brothers, I have fulfilled my duty to God in all good conscience to this day."

that we have conducted ourselves in the world, and especially in our relations with you, with integrity 
1 Thessalonians 2:10  You are witnesses, and so is God, of how holy, righteous and blameless we were among you who believed.

and godly sincerity 
2 Corinthians 2:17-20  Was I fickle when I intended to do this? Or do I make my plans in a worldly manner so that in the same breath I say both "Yes, yes" and No, no"? But as surely as God is faithful, our message to you is "Yes" and "No". For the Son of God, Jesus Christ, who was preached among you by us--by me and Silas and Timothy--was not "Yes" and "No", but in him it has always been "Yes". For no matter how many promises God has made, they are "Yes" in Christ. And so through him the "Amen" is spoken by us to the glory of God.

We have done so, relying not on worldly wisdom but on God's grace 
1 Corinthians 1:17  For Christ did not send me to baptize, but to preach the gospel--not with wisdom and eloquence, lest the cross of Christ be emptied of its power.
1 Corinthians 2:1  And so it was with me, brothers and sisters. When I came to you, I did not come with eloquence or human wisdom as I proclaimed to you the testimony about God.
1 Corinthians 1:4-5  My message and my preaching were not with wise and persuasive words, but with a demonstration of the Spirit's power, so that your faith might not rest on human wisdom, but on God's power.
1 Corinthians 2:13-16  This is what we speak, not in words taught us by human wisdom but in words taught by the Spirit, explaining spiritual realities with Spirit-taught words. The person without the Spirit does not accept the things that come from the Spirit of God but considers them foolishness, and cannot understand them because they are discerned only through the Spirit. The person with the Spirit makes judgments about all things, but such a person is not subject to merely human judgments, for, "Who has known the mind of the Lord so as to instruct him?" (Isaiah 40:13) But we have the mind of Christ.

(parentheses are mine)

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