Keep the excellent thing committed to thee This exhortation is more extensive than the preceding. He exhorts Timothy to consider what God has given to him, and to bestow care and application in proportion to the high value of that which has been committed; for, when the thing is of little value, we are not wont to call any one to so strict an account. By "that which hath been committed," I understand him to mean both the honor of the ministry and all the gifts with which Timothy was endued. Some limit it to the ministry alone; but I think that it denotes chiefly the qualifications for the ministry, that is, all the gifts of the Spirit, in which he excelled. The word "committed" is employed also for another reason, to remind Timothy that he must, one day, render an account; for we ought to administer faithfully what God has committed to us. To Kalon [1] denotes that which is of high or singular value; and, therefore, Erasmus has happily translated it (egregium) "excellent," for the sake of denoting its rare worth. I have followed that version. But what is the method of keeping it? It is this. We must beware lest we lose by our indolence what God has bestowed upon us, or lest it be taken away, because we have been ungrateful or have abused it; for there are many who reject the grace of God, and many who, after having received it, deprive themselves of it altogether. Yet because the difficulty of keeping it is beyond our strength, he therefore adds, -- By the Holy Spirit As if he had said, "I do ask from thee more than thou canst, for what thou hast not from thyself the Spirit of God will supply to thee." Hence it follows, that we must not judge of the strength of men from the commandments of God; because, as he commands by words, so he likewise engraves his words on our hearts, and, by communicating strength, causes that his command shall not be in vain. Who dwelleth in us [2] By this he means, that the assistance of the Holy Spirit is present to believers, provided that they do not reject it when it is offered to them.

Footnotes

1 - "Le mot Grec duquel il use, que nous traduisons bon." -- "The Greek word, which he employs, which we translate good."

2 - "Seeing that God hath taken up his abode in us, and wishes that we may be his temples, and dwells in those temples by his Holy Spirit, are we afraid that he will not give us power to persevere till the end, that he will not keep us in certain possession of the benefits which we have received from his hand? True, the devil will labor to deprive us of it, but, as our souls will not be a prey to him, because our Lord Jesus Christ has taken them under his protection, having been committed to him by God the Father; so nothing that God has appointed for our salvation will be a prey to Satan. And why? Because we have the Spirit to defend us against all his efforts. And where is that Spirit? We must not go to seek him above the clouds. It is true that he fills the whole earth, and that his majesty dwells above the heavens; but if we feel that he dwells in us, since he has been pleased to exercise his power on such poor creatures as we are, let us know that that power will be sufficient for defending us against the assaults of Satan; that is, provided that we, on our part, are not negligent. For we must not flatter ourselves in our sins, so as to be careless, but must pray to God, committing everything to him, and hoping that he will always strengthen us more and more. And because he has begun to make us ministers of his grace, let us know that he will continue, and in such a way that our salvation and that of our neighbor's shall always be carried forward more and more to his glory."-Fr. Ser.

That good thing which was committed unto thee; - see the notes at 1-Timothy 6:20. The reference here in the phrase, "that good thing committed to thee," is to the sound Christian doctrine with which he had been intrusted, and which he was required to transmit to others.
Keep by the Holy Ghost - By the aid of the Holy Spirit. One of the best methods of preserving the knowledge and the love of truth is to cherish the influences of the Holy Spirit.

That good thing - The everlasting Gospel, keep by the Holy Ghost; for without a continual spiritual energy man can do nothing. This indwelling Spirit will make them effectual to thy own salvation, and enable thee to preach them to the salvation of the souls of others.

(9) That good thing which was committed unto thee keep (10) by the Holy Ghost which dwelleth in us.
(9) An amplification, taken from the dignity of so great a benefit committed to the ministers.
(10) The taking away of an objection. It is a hard thing to do it, but the Spirit of God is mighty, who has inwardly endued us with his power.

That good thing which was committed to thee,.... By which he means either his ministerial work and office, which is a good work, the dispensation of which was committed to him, and which it became him so to observe, as that the ministry might not be blamed; or else the good and excellent gifts of the Spirit, which qualified him for the discharge of that work, and which were not to be neglected, but to be stirred up, exercised, and improved, lest they should be lost, or took away; or rather the Gospel, which was committed to his trust, to preach: and this may be called a good thing, from the author of it, who is good, whence it is named the Gospel of God, and the Gospel of Christ; and from the matter of it, it consists of good things come by Christ, the High priest, and which it publishes, such as peace, pardon, righteousness, and eternal salvation by him; and from the end and use of it, it being both for the glory of God, the magnifying the riches of his grace, and the exaltation of Christ; and also is the power of God in regeneration and sanctification unto salvation to everyone that believes. And it being said to be "committed to" Timothy, denotes the excellency of it; that it is a treasure, as indeed it is a rich one, it contains the riches of grace, even the unsearchable riches of Christ, is more valuable than thousands of gold and silver: and that it is a trust, and requires faithfulness in ministers, who are the stewards of it; and that it is to be accounted for. Wherefore great care should be had in dispensing and keeping it:
keep by the Holy Ghost. It should be kept pure and incorrupt, free from all the adulterations and mixtures of men; and safe and sound, that it be not snatched away from the churches by false teachers. And whereas the apostle knew, that neither Timothy, nor any other, were sufficient of themselves, for these things, he directs to the keeping of it by the Holy Ghost; who makes men overseers of churches, bestows gifts upon them, to fit them for their work, and leads them into all the truths of the Gospel; and under his influence and teachings, and by the assistance of his grace, are they enabled to discharge their trust, abide by the Gospel, and persevere in the ministration of it to the end.
Which dwelleth in us; in all believers, who are the temples of the Holy Ghost; and in all the churches, which are built up by him, an habitation for God; and in all the ministers of the word, to direct, instruct, support, and uphold them; and who dwells with them, and continues in them, and that for ever, John 14:16.

Translate as Greek, "That goodly deposit keep through the Holy Ghost," namely, "the sound words which I have committed to thee" (2-Timothy 1:13; 2-Timothy 2:2).
in us--in all believers, not merely in you and me. The indwelling Spirit enables us to keep from the robbers of the soul the deposit of His word committed to us by God.

The good thing - This wholesome doctrine.