I have always heard and believed that "it takes a lifetime to build a reputation and only a moment to lose it'. Paul had worked hard in Corinth to establish himself as a trustworthy, God fearing, God called, minister of the Gospel. As Paul fends off the attacks of false apostles he has a sterling reputation to fall back on.
I. As believers we should establish a trustworthy reputation. vs 1
II. Our reputation will be linked to our works. vs 2-3
III. Our reputation should include a humble dependence on Christ. vs 4-6
IV. Our reputation should be marked by grace and not legalism. vs 6