And confirmed in the faith. He now repeats without a figure the same thing that he had expressed by metaphors, -- that the prosecution of the way, the support of the root, and of the foundation, is firmness and steadfastness of faith. And observe, that this argument is set before them in consequence of their having been well instructed, in order that they may safely and confidently secure their footing in the faith with which they had been made acquainted. Abounding. He would not have them simply remain immovable, but would have them grow every day more and more. When he adds, with thanksgiving, he would have them always keep in mind from what source faith itself proceeds, that they may not be puffed up with presumption, but may rather with fear repose themselves in the gift of God. And, unquestionably, ingratitude is very frequently the reason why we are deprived of the light of the gospel, as well as of other divine favors.

Rootedin him - As a tree strikes its roots deep in the earth, so our faith should strike deep into the doctrine respecting the Saviour. See the phrase used here explained in the parallel place in Ephesians 3:17.
And established in the faith, as ye have been taught - To wit, by the founders of the church, and by those faithful ministers who had succeeded them; Notes, Colossians 1:7.
Abounding therein with thanksgiving - Expressing overflowing thanks to God that you have been made acquainted with truths so precious and glorious. If there is any thing for which we ought to be thankful, it is for the knowledge of the great truths respecting our Lord and Saviour.

Rooted and built up in him - It is not usual with the apostle to employ this double metaphor, taken partly from the growth of a tree and the increase of a building. They are to be rooted; as the good seed had been already sown, it is to take root, and the roots are to spread far, wide, and deep. They are to be grounded; as the foundation has already been laid, they are to build thereon. In the one case, they are to bear much fruit; in the other, they are to grow up to be a habitation of God through the Spirit. See the notes on Ephesians 2:21, Ephesians 2:22 (note); Ephesians 3:17 (note).
Abounding therein with thanksgiving - No limitation is ever set to the operations of God on the soul, or to the growth of the soul in the knowledge, love, and image of God. Those who are brought into such a state of salvation should abound in gratitude and loving obedience, as they grow in grace.

Rooted and built up in him,.... By these metaphors, the apostle expresses the safe and happy state of these believers; and which he makes use of as arguments, to engage them to walk on in Christ, and as pointing out the manner in which they should. Believers are sometimes compared to trees, and are trees of righteousness, the planting of the Lord; and their root is Christ, from whence as such they spring, and by whom they are filled with the fruits of righteousness; in him they are to abide, keep close unto him, and walk in him; deriving all their life, nourishment, fruitfulness, grace, and perseverance in it, from him as their root: they are also sometimes compared to a building, to an house, a temple, an habitation for God; and Christ is the sure and only foundation on which they are laid, and where they are safe and secure; and, being fitly joined together, grow up as an holy temple to the Lord; and this being their case, they are to go on laying the whole stress of their salvation on him, building their faith and hope of eternal glory entirely upon him; and building up one another also on their most holy faith, of which he is the substance, as it follows:
and stablished in the faith: that of Christ, or in the doctrine of faith which respects Christ: the apostle here expresses the same thing without a figure, which he had signified by the two foregoing metaphors, and explains what he means by them; namely, that they were well settled and grounded in their faith in Christ, and thoroughly instructed and established in the doctrines of the Gospel; and a very good thing it is to have the heart established with grace, both as a principle and a doctrine; which is God's work, and was the happy case of these persons; wherefore it became them to act as such, and not be like children tossed to and fro with every wind of doctrine, or carried about with divers and strange doctrines, but abide by those which had been preached to them by the faithful ministers of Christ, and they had received: as
ye have been taught: by Epaphras their minister, and others; and therefore should not listen to false teachers, and to a contrary doctrine taught by them; considering of whom they had learnt the true doctrine, what evidence it carried with it, and what use it had been of to them, in convincing, converting, comforting, instructing, and establishing them: and therefore should be
abounding therein with thanksgiving; that is, in the faith; as in the grace, so in the doctrine of faith; for as saints are to abound in the work of the Lord, and in every good work, and in the exercise of every grace, so in the knowledge of truth; see 2-Corinthians 8:7; and to make use of all means for the increase of, and growth in Gospel grace and light, and the knowledge of a crucified Christ, which is meant by abounding: for all which there is great reason for thanksgiving; both for the unspeakable gift of Christ, who is received as such by faith, and in whom believers are rooted and built up; and for faith itself, which is the gift of God; and also for the Gospel, and the truths of it; and for every degree of spiritual light in it, and knowledge of it.

Rooted-- (Ephesians 3:17).
built up--Greek, "being builded up." As "rooted" implies their vitality; so "builded up," massive solidity. As in the Song of Solomon, when one image is not sufficient to express the varied aspects of divine truth, another is employed to supply the idea required. Thus "walking," a third image (Colossians 2:6), expresses the thought which "rooted" and "built," though each suggesting a thought peculiar to itself, could not express, namely, onward motion. "Rooted" is in the past tense, implying their first conversion and vital grafting "in Him." "Built up" is present (in the Greek), implying their progressive increase in religion by union with Him. Ephesians 2:20 refers to the Church; but the passage here to their individual progress in edification (Acts 20:32).
stablished--confirmed.
as--"even as."
abounding therein with thanksgiving--advancing to fuller maturity (compare Colossians 2:2) in the faith, "with thanksgiving" to God as the gracious Author of this whole blessing.

Rooted in him - As the vine. Built - On the sure foundation.