In these verses observe,

I.The apostle threatens to be severe against obstinate sinners when he should come to Corinth, having now sent to them a first and second epistle, with proper admonitions and exhortations, in order to reform what was amiss among them. Concerning this we may notice, 1. The caution with which he proceeded in his censures: he was not hasty in using severity, but gave a first and second admonition. So some understand his words (Co2 13:1): This is the third time I am coming to you, referring to his first and second epistles, by which he admonished them, as if he were present with them, though in person he was absent, Co2 13:2. According to this interpretation, these two epistles are the witnesses he means in the first verse, referring rather to the direction of our Saviour (Mat 17:16) concerning the manner how Christians should deal with offenders before they proceed to extremity than to the law of Moses (Deu 17:6; Deu 19:15) for the behaviour of judges in criminal matters. We should go, or send, to our brother, once and again, to tell him of his fault. Thus the apostle had told these Corinthians before, in his former epistle, and now he tells them, or writes to those who heretofore had sinned, and to all others, giving warning unto all before he came in person the third time, to exercise severity against scandalous offenders. Others think that the apostle had designed and prepared for his journey to Corinth twice already, but was providentially hindered, and now informs them of his intentions a third time to come to them. However this be, it is observable that he kept an account how often he endeavoured, and what pains he took with these Corinthians for their good: and we may be sure that an account is kept in heaven, and we must be reckoned with another day for the helps we have had for our souls, and how we have improved them. 2. The threatening itself: That if (or when) he came again (in person) he would not spare obstinate sinners, and such as were impenitent, in their scandalous enormities. He had told them before, he feared God would humble him among them, because he should find some who had sinned and had not repented; and now he declares he would not spare such, but would inflict church-censures upon them, which are thought to have been accompanied in those early times with visible and extraordinary tokens of divine displeasure. Note, Though it is God's gracious method to bear long with sinners, yet he will not bear always; at length he will come, and will not spare those who remain obstinate and impenitent, notwithstanding all his methods to reclaim and reform them.

II.The apostle assigns a reason why he would be thus severe, namely, for a proof of Christ's speaking in him, which they sought after, Co2 13:3. The evidence of his apostleship was necessary for the credit, confirmation, and success, of the gospel he preached; and therefore such as denied this were justly and severely to be censured. It was the design of the false teachers to make the Corinthians call this matter into question, of which yet they had not weak, but strong and mighty proofs (Co2 13:3), notwithstanding the mean figure he made in the world and the contempt which by some was cast upon him. Even as Christ himself was crucified through weakness, or appeared in his crucifixion as a weak and contemptible person, but liveth by the power of God, or in his resurrection and life manifests his divine power (Co2 13:4), so the apostles, how mean and contemptible soever they appeared to the world, did yet, as instruments, manifest the power of God, and particularly the power of his grace, in converting the world to Christianity. And therefore, as a proof to those who among the Corinthians sought a proof of Christ's speaking in the apostle, he puts them upon proving their Christianity (Co2 13:5): Examine yourselves, etc. Hereby he intimates that, if they could prove their own Christianity, this would be a proof of his apostleship; for if they were in the faith, if Jesus Christ was in them, this was a proof that Christ spoke in him, because it was by his ministry that they did believe. He had been not only an instructor, but a father to them. He had begotten them again by the gospel of Christ. Now it could not be imagined that a divine power should go along with his ministrations if he had not his commission from on high. If therefore they could prove themselves not to be reprobates, not to be rejected of Christ, he trusted they would know that he was not a reprobate (Co2 13:6), not disowned by Christ. What the apostle here says of the duty of the Corinthians to examine themselves, etc., with the particular view already mentioned, is applicable to the great duty of all who call themselves Christians, to examine themselves concerning their spiritual state. We should examine whether we be in the faith, because it is a matter in which we may be easily deceived, and wherein a deceit is highly dangerous: we are therefore concerned to prove our own selves, to put the question to our own souls, whether Christ be in us, or not; and Christ is in us, except we be reprobates: so that either we are true Christians or we are great cheats; and what a reproachful thing is it for a man not to know himself, not to know his own mind!

For though he was crucified through weakness - It is true Christ was crucified, and his crucifixion appeared to be the effect of his weakness; yet even this was not so; he gave up his life, none could take it away from him; and in his last struggle, had he even been deficient in power, he could have had more than twelve legions of angels to support him against the high priest's mob, Mat 26:53; but how then could the Scripture be fulfilled? And had he not died, how could the human race have been saved?

Yet he liveth by the power of God - Though he appeared to be crucified through his own weakness, yet he now liveth by the power of God; exerting an almighty energy by which all things are subject to him.

We also are weak in him - Because we are on Christ's side we appear to you as weak as he did to the Jews; but it is not so, for we live with him - under the same influence, and partaking of the same life; manifesting by our preaching and miracles the power of God towards you. While I do not use the rod, I appear to you weak; I will use it, and then you shall find me to be strong.

Since ye seek a proof of Christ - The conversion of the Corinthians was to themselves a solid proof that Christ spoke by the apostle; and therefore he could, with great propriety, say that this power of Christ, far from being weak, was mighty among them.

For though he was crucified through weakness,.... Of the human nature; for the nature which Christ assumed was in all things like to ours, excepting sin; it was subject to all sinless infirmities; it was mortal, passible, liable to sufferings, and death, and so he came to be crucified; though not against his will, or without his previous assent; as God, he was able to have prevented his crucifixion if he would; he gave an instance of his power over men, at the time of his apprehension, by striking them down to the ground; and told Pilate his judge at his trial, that he could have no power to crucify him, if it was not given him from above; and he showed his superiority over devils when upon the cross, by spoiling principalities and powers; so that his crucifixion was not owing to want of power as God, but he became capable of it through his weakness as man:

but yet he lives by the power of God; he was raised from the dead by a divine power; by his own power as God, as well as by his Father's, and so was declared to be the Son of God with power; and he lives at the right hand of God as man and Mediator, vested with all power in heaven and in earth; though, in the days of his flesh, he appeared so weak, mean, and despicable: now the apostle mentions this case of our Lord's, to deter the Corinthians from despising him, on account of his outward weakness and meanness; and from hence buoying themselves up, and in which they were encouraged by the false apostles, that he had not, and could not exercise the power he talked of; they had observed what mean figure he made when he was among them; and whatever weight there might be in his letters, yet his bodily presence was weak, and his speech contemptible; wherefore he sets before them the instance of Christ, who though he appeared very weak in his state of humiliation, yet he now lives in power, to assist and strengthen his ministers, in every branch of their work; and suggests, that as it was with Christ, it was, and would be in some measure with him, and his fellow ministers:

for we also are weak in him: like him, and for his sake, they were subject to infirmities, reproaches, persecutions, and distresses; carried about daily the dying of the Lord Jesus; bore a very great resemblance to him in his state of humiliation; were very much as he was in this world, and bore much for his name's sake; the Alexandrian copy and the Syriac version read, "with him"; being crucified with him, and dead with him:

but we shall live with him by the power of God towards you; which is not to be understood of being raised by Christ to an immortal life, and of living with him in glory; though this is a certain truth, that such who suffer with Christ, shall live and reign, and be glorified together with him; but of the life, power, and efficacy of the ministers of Christ, and of Christ in and with them, displayed in the lively ministration of the word and ordinances, in the vigorous discharge of all the branches of their office; not only in preaching, but in rebuking, admonishing, laying on of censures, and punishing criminals; and especially regards the powerful exertion and use of the apostolic rod; for this life is not only with Christ, or through Christ being in them, notwithstanding all their outward weakness, and by the power of God, which supports them under all, and enables them to perform their work, but is "towards you"; the Corinthians, to be exercised towards them, to be seen among them, and felt by them.

though--omitted in some of the oldest manuscripts; then translate, "For He was even crucified," &c.

through weakness--Greek, "from weakness"; that is, His assumption of our weakness was the source, or necessary condition, from which the possibility of His crucifixion flowed (Heb 2:14; Phi 2:7-8).

by--Greek, "from"; "owing to."

the power of God--the Father (Rom 1:4; Rom 6:4; Eph 1:20).

weak in him--that is, in virtue of our union with Him, and after His pattern, weakness predominates in us for a time (exhibited in our "infirmities" and weak "bodily presence," Co2 10:10; Co2 12:5, Co2 12:9-10; and also in our not putting into immediate exercise our power of punishing offenders, just as Christ for a time kept in abeyance His power).

we shall live with him--not only hereafter with Him, free from our present infirmities, in the resurrection life (Phi 3:21), but presently in the exercise of our apostolic authority against offenders, which flows to us in respect to you from the power of God, however "weak" we now seem to you. "With Him," that is, even as He now exercises His power in His glorified resurrection life, after His weakness for a time.