What does 2 Corinthians 1:12 mean?
From the context of this letter, it seems Paul's value as an apostle, his integrity, and his approach to ministry were all under attack in Corinth. At the very least, some in the church were challenging him. This might have come at the prompting of other teachers that had come in among them and gained their favor.Paul has already addressed one concern of the people: that someone who is truly an apostle of Jesus should not experience so much suffering (2 Corinthians 1:8–11). He has shown that the opposite is true. Now he begins to defend his integrity.
In the typical context, boasting is presented as sinful or foolish in the New Testament, since the term most often means a person bragging about their own positive traits. Paul taught that boasting in one's own abilities and achievements was wrong (1 Corinthians 1:29; 4:7; Ephesians 2:9). Paul did, however, "boast" in what the Lord had done, including in what the Lord had done through him (Romans 15:17; 1 Corinthians 1:31). Here he declares his only boast: that by God's grace his conscience confirms his right conduct. Paul and his co-workers have behaved with "simplicity," meaning with integrity, openness, and honesty, and not according to the standards of worldly wisdom.
Paul adds that he and his team have behaved in this honorable way, by God's grace, especially with the Corinthians. That does not mean Paul cut corners on integrity with other people. Rather, it suggests that because of the sometimes confrontational nature of his relationship with the Corinthians (1 Corinthians 1:10–17), he has been careful to avoid even the hint of inappropriate behavior.