Albert Barnes' Notes on the Whole Bible - 2 Corinthians 3:5
Not that we are sufficient of ourselves - This is evidently designed to guard against the appearance of boasting, or of self-confidence. He had spoken of his confidence; of his triumph; of his success; of his undoubted evidence that God had sent him. He here says, that he did not mean to be understood as affirming that any of his success came from himself, or that he was able by his own strength to accomplish the great things which had been effected by his ministry. He well knew that he had no... read more
The Pulpit Commentary - 2 Corinthians 3:5
Not that we are sufficient of ourselves. He here reverts to the question asked in 2 Corinthians 2:16 . He cannot bear the implication that any "confidence" on his part rests on anything short of the overwhelming sense that he is but an agent, or rather nothing but an instrument, in the hands of God. To think anything as of ourselves. He has, indeed, the capacity to form adequate judgments about his work, but it does not come from his own resources ( ἀφ ̓ ἑαυτῶν ) or his own... read more