In these verses,

I.The apostle makes an apology for seeming to commend himself. He thought it convenient to protest his sincerity to them, because there were some at Corinth who endeavoured to blast his reputation; yet he was not desirous of vain-glory. And he tells them, 1. That he neither needed nor desired any verbal commendation to them, nor letters testimonial from them, as some others did, meaning the false apostles or teachers, Co2 3:1. His ministry among them had, without controversy, been truly great and honourable, how little soever his person was in reality, or how contemptible soever some would have him thought to be. 2. The Corinthians themselves were his real commendation, and a good testimonial for him, that God was with him of a truth, that he was sent of God: You are our epistle, Co2 3:2. This was the testimonial he most delighted in, and what was most dear to him - they were written in his heart; and this he could appeal to upon occasion, for it was, or might be, known and read of all men. Note, There is nothing more delightful to faithful ministers, nor more to their commendation, than the success of their ministry, evidenced in the hearts and lives of those among whom they labour.

II.The apostle is careful not to assume too much to himself, but to ascribe all the praise to God. Therefore, 1. He says they were the epistle of Christ, Co2 3:3. The apostle and others were but instruments, Christ was the author of all the good that was in them. The law of Christ was written in their hearts, and the love of Christ shed abroad in their hearts. This epistle was not written with ink, but with the Spirit of the living God; nor was it written in tables of stone, as the law of God given to Moses, but on the heart; and that heart not a stony one, but a heart of flesh, upon the fleshy (not fleshly, as fleshliness denotes sensuality) tables of the heart, that is, upon hearts that are softened and renewed by divine grace, according to that gracious promise, I will take away the stony heart, and I will give you a heart of flesh, Eze 36:26. This was the good hope the apostle had concerning these Corinthians (Co2 3:4) that their hearts were like the ark of the covenant, containing the tables of the law and the gospel, written with the finger, that is, by the Spirit, of the living God. 2. He utterly disclaims the taking of any praise to themselves, and ascribes all the glory to God: "We are not sufficient of ourselves, Co2 3:5. We could never have made such good impressions on your hearts, nor upon our own. Such are our weakness and inability that we cannot of ourselves think a good thought, much less raise any good thoughts or affections in other men. All our sufficiency is of God; to him therefore are owing all the praise and glory of that good which is done, and from him we must receive grace and strength to do more." This is true concerning ministers and all Christians; the best are no more than what the grace of God makes them. Our hands are not sufficient for us, but our sufficiency is of God; and his grace is sufficient for us, to furnish us for every good word and work.

Not that we are sufficient of ourselves - We do not arrogate to ourselves any power to enlighten the mind or change the heart, we are only instruments in the hand of God. Nor was it possible for us apostles to think, to invent, such a scheme of salvation as is the Gospel; and if we even had been equal to the invention, how could we have fulfilled such promises as this scheme of salvation abounds with? God alone could fulfill these promises, and he fulfils only those which he makes himself. All these promises have been amen-ratified and fulfilled to you who have believed on Christ Jesus according to our preaching; therefore, ye are God's workmanship and it is only by God's sufficiency that we have been able to do any thing. This I believe to be the apostle's meaning in this place, and that he speaks here merely of the Gospel scheme, and the inability of human wisdom to invent it; and the words λογισασθαι τι, which we translate to think any thing, signify, properly, to find any thing out by reasoning; and as the Gospel scheme of salvation is the subject in hand, to that subject the words are to be referred and limited. The words, however, contain also a general truth; we can neither think, act, nor be, without God. From him we have received all our powers, whether of body or of mind, and without him we can do nothing. But we may abuse both our power of thinking and acting; for the power to think, and the power to act, are widely different from the act of thinking, and the act of doing. God gives us the power or capacity to think and act, but he neither thinks nor acts for us. It is on this ground that we may abuse our powers, and think evil, and act wickedly; and it is on this ground that we are accountable for our thoughts, words, and deeds.

Not that we are sufficient of ourselves,.... Though we are sufficient for this work to which God has called us, and have such trust and confidence that he has blessed and owned us, and done such great things by us; yet we do not ascribe anything to ourselves, to any power of ours, to any self-sufficiency in us: for "we are not sufficient of ourselves" neither for the work of the ministry, nor for the conversion of sinners, nor for faith and hope in God, nor for any spiritual work whatever; not even to think anything as of ourselves; any good thing, either for our own use and benefit, or for the advantage of others; we are not able of ourselves to meditate with judgment and affection upon the word of God, to study the Scriptures, to collect from them things fit for the ministry; and much less with freedom and boldness to speak of them to edification; and still less able to impress them upon the heart: for though you who are the epistle of Christ are ministered by us, yet not by any power and self-sufficiency of ours;

but our sufficiency is of God; to think, to speak, and to act for his glory.

The Greek is, "Not that we are (even yet after so long experience as ministers) sufficient to think anything OF ourselves as (coming) FROM ourselves; but our sufficiency is (derived) FROM God." "From" more definitely refers to the source out of which a thing comes; "of" is more general.

to think--Greek, to "reason out" or "devise"; to attain to sound preaching by our reasonings [THEODORET]. The "we" refers here to ministers (Pe2 1:21).

anything--even the least. We cannot expect too little from man, or too much from God.