2 Corinthians 3:5

Not that we are sufficient of ourselves, to account any thing as from ourselves; but our sufficiency is from God.

See under 2Cor. 3:2,2 Corinthians 3:3. Although claiming the Corinthians as his epistle, he wished to make it clear that the true author is God, and that to him all of the glory belongs, hence the repetition of this thought here. Back in 2 Corinthians 2:16, Paul's implied answer to the question, "Who is sufficient for these things?" was to the effect that he and the other apostles were sufficient because they preached the true word of God and did not adulterate it. In that sense, of course, they were sufficient; but here Paul registered the great truth that only God is truly sufficient.