But if I tarry long, that thou mayest know how thou oughtest to behave thyself in the {7} house of God, which is the church of the living God, the {i} pillar and ground of the truth.

(7) The pastor always has to consider how he carries out his duties in the house of the living God, in which the treasure of the truth is kept.

(i) That is, with regard to man: for the Church rested upon that cornerstone, Christ, and is the preserver of the truth, but not the mother.

People's New Testament

3:15 But if I tarry. In that case he wrote that Timothy might understand how to act.

How thou oughtest to behave thyself in the house of God. Conduct thyself in the management of the church.

Which is the church of the living God. The house of God is not the temple of Diana, which stood there at Ephesus.

The pillar and ground of the truth. The church is the pillar and support of the truth because it preaches it to the world, preserves it, and transmits it from generation to generation.

Wesley's Notes

3:15 That thou mayest know how to behave - This is the scope of the epistle. In the house of God - Who is the master of the family. Which is - As if he had said, By the house of God, I mean the church.

King James Translators' Notes

ground: or, stay

Scofield Reference Notes

[1] church

Church (visible), Summary: The passages under this head 1Cor 10:32 1Tim 3:15 refer to that visible body of professed believers called, collectively, "the Church," of which history takes account as such, though it exists under many names and divisions based upon differences in doctrine or in government. Within, for the most part, this historical "Church" has existed the true Church, "which is his body, the fulness of him that filleth all in all Eph 1:22,23.

See Scofield Note: "Heb 12:23" like the believing Remnant within Israel

See Scofield Note: "Rom 11.5" The predicted future of the visible Church is apostasy Lk 18:8 2Tim 3:1-8 of the true Church, glory Mt 13:36-43 Rom 8:18-23 1Th 4:14-17.

Jamieson-Fausset-Brown Bible Commentary

15. But if I tarry long-before coming to thee.

that-that is, I write (1Ti 3:14) "that thou mayest know," &c.

behave thyself-in directing the Church at Ephesus (1Ti 4:11).

the house of God-the Church (Heb 3:2, 5, 6; 10:21; 1Pe 4:17; 1Co 3:16, "the temple of God"; Eph 2:22).

which is-that is, inasmuch as it is.

the church-"the congregation." The fact that the sphere of thy functions is "the congregation of the living God" (who is the ever living Master of the house, 2Ti 2:19, 20, 21), is the strongest motive to faithfulness in this behavior as president of a department of the house." The living God forms a striking contrast to the lifeless idol, Diana of Ephesus (1Th 1:9). He is the fountain of "truth," and the foundation of our "trust" (1Ti 4:10). Labor directed to a particular Church is service to the one great house of God, of which each particular Church is a part, and each Christian a lively stone (1Pe 2:5).

the pillar and ground of the truth-evidently predicated of the Church, not of "the mystery of godliness" (an interpretation not started till the sixteenth century; so Bengel); for after two weighty predicates, "pillar and ground," and these substantives, the third, a much weaker one, and that an adjective, "confessedly," or "without controversy great," would not come. "Pillar" is so used metaphorically of the three apostles on whom principally the Jewish Christian Church depended (Ga 2:9; compare Re 3:12). The Church is "the pillar of the truth," as the continued existence (historically) of the truth rests on it; for it supports and preserves the word of truth. He who is of the truth belongs by the very fact to the Church. Christ is the alone ground of the truth in the highest sense (1Co 3:11). The apostles are foundations in a secondary sense (Eph 2:20; Re 21:14). The Church rests on the truth as it is in Christ; not the truth on the Church. But the truth as it is in itself is to be distinguished from the truth as it is acknowledged in the world. In the former sense it needs no pillar, but supports itself; in the latter sense, it needs the Church as its pillar, that is, its supporter and preserver [Baumgarten]. The importance of Timothy's commission is set forth by reminding him of the excellence of "the house" in which he serves; and this in opposition to the coming heresies which Paul presciently forewarns him of immediately after (1Ti 4:1). The Church is to be the stay of the truth and its conserver for the world, and God's instrument for securing its continuance on earth, in opposition to those heresies (Mt 16:18; 28:20). The apostle does not recognize a Church which has not the truth, or has it only in part. Rome falsely claims the promise for herself. But it is not historical descent that constitutes a Church, but this only, to those heresies (Mt 16:18; 28:20). The apostle does not recognize a Church which has not the intermediate; the "ground," or "basement" (similar to "foundation," 2Ti 2:19), the final support of the building [Alford]. It is no objection that, having called the Church before "the house of God," he now calls it the "pillar"; for the literal word "Church" immediately precedes the new metaphors: so the Church, or congregation of believers, which before was regarded as the habitation of God, is now, from a different point of view, regarded as the pillar upholding the truth.

Matthew Henry's Concise Commentary

3:14-16 The church is the house of God; he dwells there. The church holds forth the Scripture and the doctrine of Christ, as a pillar holds forth a proclamation. When a church ceases to be the pillar and ground of truth, we may and ought to forsake her; for our regard to truth should be first and greatest. The mystery of godliness is Christ. He is God, who was made flesh, and was manifest in the flesh. God was pleased to manifest himself to man, by his own Son taking the nature of man. Though reproached as a sinner, and put to death as a malefactor, Christ was raised again by the Spirit, and so was justified from all the false charges with which he was loaded. Angels ministered to him, for he is the Lord of angels. The Gentiles welcomed the gospel which the Jews rejected. Let us remember that God was manifest in the flesh, to take away our sins, to redeem us from all iniquity, and to purify unto himself a peculiar people, zealous of good works. These doctrines must be shown forth by the fruits of the Spirit in our lives.

Matthew Henry's Whole Bible Commentary

Verses 14-16

He concludes the chapter with a particular direction to Timothy. He hoped shortly to come to him, to give him further directions and assistance in his work, and to see that Christianity was well planted, and took root well, at Ephesus; he therefore wrote the more briefly to him. But he wrote lest he should tarry long, that Timothy might know how to behave himself in the house of God, how to conduct himself as became an evangelist, and the apostle's substitute. Observe,

I. Those who are employed in the house of God must see to it that they behave themselves well, lest they bring reproach upon the house of God, and that worthy name by which they are called. Ministers ought to behave themselves well, and to look not only to their praying and preaching, but to their behaviour: their office binds them to their good behaviour, for any behaviour will not do in this case. Timothy must know how to behave himself, not only in the particular church where he was now appointed to reside for some time, but being an evangelist, and the apostle's substitute, he must learn how to behave himself in other churches, where he should in like manner be appointed to reside for some time; and therefore it is not the church of Ephesus, but the catholic church, which is here called the house of God, which is the church of the living God. Observe here, 1. God is the living God; he is the fountain of life, he is life in himself, and he gives life, breath, and all things to his creatures; in him we live, and move, and have our being, Acts 17:25, 28. 2. The church is the house of God, he dwells there; the Lord has chosen Zion, to dwell there. "This is my rest, here will I dwell, for I have chosen it;" there may we see God's power and glory, Ps. 63:2.

II. It is the great support of the church that it is the church of the living God, the true God in opposition to false gods, dumb and dead idols.

1. As the church of God, it is the pillar and ground of truth; that is, either, (1.) The church itself is the pillar and ground of truth. Not that the authority of the scriptures depends upon that of the church, as the papists pretend, for truth is the pillar and ground of the church; but the church holds forth the scripture and the doctrine of Christ, as the pillar to which a proclamation is affixed holds forth the proclamation. Even to the principalities and powers in heavenly places is made known by the church the manifold wisdom of God, Eph. 3:10. (2.) Others understand it of Timothy. He, not he himself only, but he as an evangelist, he and other faithful ministers, are the pillars and ground of truth; it is their business to maintain, hold up, and publish, the truths of Christ in the church. It is said of the apostles that they seemed to be pillars, Gal. 2:9. [1.] Let us be diligent and impartial in our own enquiries after truth; let us buy the truth at any rate, and not think much of any pains to discover it. [2.] Let us be careful to keep and preserve it. "Buy the truth, and sell it not (Prov. 23:23), do not part with it on any consideration." [3.] Let us take care to publish it, and to transmit it safe and uncorrupted unto posterity. [4.] When the church ceases to be the pillar and ground of truth, we may and ought to forsake her; for our regard to truth should be greater than our regard to the church; we are no longer obliged to continue in the church than she continues to be the pillar and ground of truth.

2. But what is the truth which the churches and ministers are the pillars and grounds of? He tells us (v. 16) that without controversy great is the mystery of godliness. The learned Camero joins this with what goes before, and then it runs thus: "The pillar and ground of the truth, and without controversy great is the mystery of godliness." He supposes this mystery to be the pillar, etc. Observe,

(1.) Christianity is a mystery, a mystery that could not have been found out by reason or the light of nature, and which cannot be comprehended by reason, because it is above reason, though not contrary thereto. It is a mystery, not of philosophy or speculation; but of godliness, designed to promote godliness; and herein it exceeds all the mysteries of the Gentiles. It is also a revealed mystery, not shut up and sealed; and it does not cease to be a mystery because now in part revealed. But,

(2.) What is the mystery of godliness? It is Christ; and here are six things concerning Christ, which make up the mystery of godliness. [1.] That he is God manifest in the flesh: God was manifest in the flesh. This proves that he is God, the eternal Word, that was made flesh and was manifest in the flesh. When God was to be manifested to man he was pleased to manifest himself in the incarnation of his own Son: The Word was made flesh, Jn. 1:14. [2.] He is justified in the Spirit. Whereas he was reproached as a sinner, and put to death as a malefactor, he was raised again by the Spirit, and so was justified from all the calumnies with which he was loaded. He was made sin for us, and was delivered for our offences; but, being raised again, he was justified in the Spirit; that is, it was made to appear that his sacrifice was accepted, and so he rose again for our justification, as he was delivered for our offences, Rom. 4:25. He was put to death in the flesh, but quickened by the Spirit, 1 Pt. 3:18. [3.] He was seen of angels. They worshipped him (Heb. 1:6); they attended his incarnation, his temptation, his agony, his death, his resurrection, his ascension; this is much to his honour, and shows what a mighty interest he had in the upper world, that angels ministered to him, for he is the Lord of angels. [4.] He is preached unto the Gentiles. This is a great part of the mystery of godliness, that Christ was offered to the Gentiles a Redeemer and Saviour; that whereas, before, salvation was of the Jews, the partition-wall was now taken down, and the Gentiles were taken in. I have set thee to be a light of the Gentiles, Acts 13:47. [5.] That he was believed on in the world, so that he was not preached in vain. Many of the Gentiles welcomed the gospel which the Jews rejected. Who would have thought that the world, which lay in wickedness, would believe in the Son of God, would take him to be their Saviour who was himself crucified at Jerusalem? But, notwithstanding all the prejudices they laboured under, he was believed on, etc. [6.] He was received up into glory, in his ascension. This indeed was before he was believed on in the world; but it is put last, because it was the crown of his exaltation, and because it is not only his ascension that is meant, but his sitting at the right hand of God, where he ever lives, making intercession, and has all power, both in heaven and earth, and because, in the apostasy of which he treats in the following chapter, his remaining in heaven would be denied by those who pretend to bring him down on their altars in the consecrated wafers. Observe, First, He who was manifest in flesh was God, really and truly God, God by nature, and not only so by office, for this makes it to be a mystery. Secondly, God was manifest in flesh, real flesh. Forasmuch as the children are partakers of flesh and blood, he also himself likewise took part of the same, Heb. 2:14. And, what is more amazing, he was manifest in the flesh after all flesh had corrupted his way, though he himself was holy from the womb. Thirdly, Godliness is a mystery in all its parts and branches, from the beginning to the end, from Christ's incarnation to his ascension. Fourthly, It being a great mystery, we should rather humbly adore it, and piously believe it, than curiously pry into it, or be too positive in our explications of it and determinations about it, further than the holy scriptures have revealed it to us.