In order to make the Gentiles obedient, etc. These words prove what his object was, even to render his ministry approved by the Romans, that his doctrine might not be without fruit. He proves then by evidences that God by the presence of his power had given a testimony to his preaching, and in a manner sealed his apostleship, so that no one ought to have doubted, but, that he was appointed and sent by the Lord. The evidences were word, work, and miracles. It hence appears that the term work includes more than miracles. He at last concludes with this expression, through the power of the Spirit; by which he intimates that these things could not have been done without the Spirit being the author. In short, he declares that with regard to his teaching as well as his doing, he had such strength and energy in preaching Christ, that it was evidently the wonderful power of God, and that miracles were also added, which were seals to render the evidence more certain. He mentions word and work in the first place, and then he states one kind of work, even the power of performing miracles. The same order is observed by Luke, when he says that Christ was mighty in word and work, (Luke 24:19;) and John says that Christ referred the Jews to his own works for a testimony of his divinity. (John 5:36.) Nor does he simply mention miracles, but gives them two designations. But instead of what he says here, the power of signs and of wonders, Peter has "miracles and signs and wonders." (Acts 2:22.) And doubtless they were testimonies of divine power to awaken men, that being struck with God's power, they might admire and at the same time adore him; nor are they without an especial meaning, but intended to stimulate us, that we may understand what God is. This is a striking passage respecting the benefit of miracles: they are designed to prepare men to reverence and to obey God. So you read in Mark, that the Lord confirmed the truth by the signs which followed. (Mark 16:20.) Luke declares in the Acts, that the Lord by miracles gave testimony to the word of his grace. (Acts 14:3.) It is then evident that those miracles which bring glory to creatures and not to God, which secure credit to lies and not to God's word, are from the devil. The power of the Spirit, which he mentions in the third place, I apply to both the preceding clauses. [1]

Footnotes

1 - Some, as Beza and Grotius, understand by the last clause, "through the power of the Spirit of God," the internal power of speaking with tongues, etc., and by "signs and wonders," the external work of healing the sick, etc. But this passage is evidently an instance of the Apostle's usual mode of stating things. "Word" means preaching; and "work," the doing of miracles. He first specifies the last, the work was that of "signs and wonders;" and then he mentions what belongs to the first, and shows how it became effectual, that is, through the power of the Spirit. See a similar arrangement in 1-Corinthians 6:11; where he mentions washed, sanctified and justified; and then he mentions first what belongs to the last, "in the name of the Lord Jesus," and afterwards what appertains to the first words, "and by the Spirit of our God." "Signs and wonders" are often mentioned together: they designate the same things by different names: miracles were called "signs," because they were evidences of divine power, and they were called "wonders," or prodigies, because they were not according to the course of nature, but were extraordinary things. By these words their design and character are set forth. -- Ed.

For I will not dare to speak - I should be restrained; I should be afraid to speak, if the thing were not as I have stated. I should be afraid to set up a claim beyond what is strictly in accordance with the truth.
Which Christ hath not wrought by me - I confine myself "strictly" to what I have done. I do not arrogate to myself what Christ has done by others. I do not exaggerate my own success, or claim what others have accomplished.
To make the Gentiles obedient - To bring them to obey God in the gospel.
By word and deed - By preaching, and by all other means; by miracle, by example, etc. The "deeds," that is, the "lives" of Christian ministers are often as efficacious in bringing people to Christ as their public ministry.

For I will not dare to speak - If the thing were not as I have stated it, I would not dare to arrogate to myself honors which did not belong to me. But God has made me the apostle of the Gentiles; and the conversion of the Gentiles is the fruit of my ministry, Christ having wrought by me for this purpose.
By word and deed - Αογῳ και εργῳ· These words may refer to the doctrines which he taught and to the miracles which he wrought among them. So they became obedient to the doctrines, on the evidence of the miracles with which they were accompanied.

For I will not dare to speak of any of those things which (n) Christ hath not wrought by me, to make the Gentiles obedient, by word and deed,
(n) Christ was so with me in all things, and by all means, that even if I had wanted to, yet I cannot say what he has done by me to bring the Gentiles to obey the gospel.

For I will not dare to speak of any of those things,.... He suggests that the false teachers did speak of things which were not done by them at all, and much less were what Christ had done by them; and signifies that he was a conscientious man, and could speak nothing but what was truth; his conscience would not suffer him, nor could he allow himself to make mention of anything, that was not done by him, as if it was; nor of anything that was done by himself, nor of anything that was done, as if it was done by himself, but as it was wrought by Christ; nor had he any need to speak of any other things which he had wrought himself, as he could not of what he had not wrought at all; or, as he says,
which Christ hath not wrought by me: signifying that what he had wrought, and which he could with good conscience speak of to the honour of Christ, and the glory of his grace, were not wrought by himself, but what Christ wrought by him; he was only the instrument, Christ was the efficient cause: as a Christian, it was not he that lived, but Christ lived in him; as a minister, it was not he that spoke, but Christ spoke in him; nor was it he that laboured, but the grace of Christ that was with him; much less was it he that converted souls, but Christ did it by him:
to make the Gentiles obedient; the nations of the world, who had been brought up in blindness and ignorance of God, in rebellion and disobedience to him. The Gospel was sent among them, and was blessed unto them, to make them, of disobedient, obedient ones; not to men, but to God; not to magistrates and ministers, though they were taught to be so to both, but to Christ; to him as a priest, by being made willing to be saved by him, and him only, renouncing their own works, and disclaiming all other ways of salvation; and to submit to his righteousness for their justification before God, and acceptance with him; and to deal with his precious blood for pardon and cleansing; to rely on his sacrifice for the atonement of their sins, and to make use of him as the new and living way to the Father, as their one and only mediator, advocate, and intercessor; and to him as a prophet, to the faith of the Gospel, and the doctrines of it; not barely by hearing it, and notionally assenting to it, but by embracing it heartily, and professing it publicly and sincerely; and to him as a King, by owning him as such, and as theirs; and by subjecting to his ordinances, and obeying his commands in faith and fear, and from love to him: the means whereby these persons were brought to the obedience of Christ, and of faith, are
by word and deed; or "deeds", as the Vulgate Latin, Syriac, and Ethiopic versions read: by the former is meant, the word of the Gospel and the preaching of it, being sent unto them, and coming with power, and not as the word of man, but as the word of God; and by the latter, either the labour of the apostle, the pains he took, the hardships he endured, in ministering: the Gospel to them; or his agreeable life and conversation, which were a means of recommending the word, and of engaging an attention to it; or rather the miraculous works and mighty deeds which were wrought by the apostle, in confirmation of the doctrine he preached, as it seems to be explained in Romans 15:19.

For I will not dare to speak of any--"to speak aught"
of those things which Christ hath not wrought by me--a modest, though somewhat obscure form of expression, meaning, "I will not dare to go beyond what Christ hath wrought by me"--in which form accordingly the rest of the passage is expressed. Observe here how Paul ascribes all the success of his labors to the activity of the living Redeemer, working in and by him.
by word and deed--by preaching and working; which latter he explains in the next clause.

By word - By the power of the Spirit. By deed - Namely, through "mighty signs and wonders."