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17. That Christ may dwell. He explains what is meant by “the strength of the inner man.” As

“it pleased the Father that in him should all fullness dwell,” (Colossians 1:19,)

so he who has Christ dwelling in him can want nothing. It is a mistake to imagine that the Spirit can be obtained without obtaining Christ; and it is equally foolish and absurd to dream that we can receive Christ without the Spirit. Both doctrines must be believed. We are partakers of the Holy Spirit, in proportion to the intercourse which we maintain with Christ; for the Spirit will be found nowhere but in Christ, on whom he is said, on that account, to have rested; for he himself says, by the prophet Isaiah, “The Spirit of the Lord God is upon me.” (Isaiah 61:1; Luke 4:18.) But neither can Christ be separated from his Spirit; for then he would be said to be dead, and to have lost all his power.

Justly, therefore, does Paul affirm that the persons who are endowed by God with spiritual vigor are those in whom Christ dwells. He points to that part in which Christ peculiarly dwells, in your hearts, — to show that it is not enough if the knowledge of Christ dwell on the tongue or flutter in the brain.

May dwell through faith. The method by which so great a benefit is obtained is also expressed. What a remarkable commendation is here bestowed on faith, that, by means of it, the Son of God becomes our own, and “makes his abode with us!” (John 14:23.) By faith we not only acknowledge that Christ suffered and rose from the dead on our account, but, accepting the offers which he makes of himself, we possess and enjoy him as our Savior. This deserves our careful attention. Most people consider fellowship with Christ, and believing in Christ, to be the same thing; but the fellowship which we have with Christ is the consequence of faith. In a word, faith is not a distant view, but a warm embrace, of Christ, by which he dwells in us, and we are filled with the Divine Spirit.

That ye may be rooted and grounded in love. Among the fruits of Christ’s dwelling in us the apostle enumerates love and gratitude for the Divine grace and kindness exhibited to us in Christ. Hence it follows, that this is true and solid excellence; so that, whenever he treats of the perfection of the saints, he views it as consisting of these two parts. The firmness and constancy which our love ought to possess are pointed out by two metaphors. There are many persons not wholly destitute of love; but it is easily removed or shaken, because its roots are not deep. Paul desires that it should be rooted ¹³⁶¹³⁶     “Meaning (by a continuation of the same architectural metaphor) that ‘the love should be deep and sincere;’ and though ἐρ᾿ῥιζωμένοι be properly applicable to trees, yet it was sometimes used of the foundations of massy edifices; in which case, however, it is in the classical writers almost always accompanied with some word which has reference to buildings.”. — Bloomfield. and grounded, — thoroughly fixed in our minds, so as to resemble a well-founded building or deeply-planted tree. The true meaning is, that our roots ought to be so deeply planted, and our foundation so firmly laid in love, that nothing will be able to shake us. It is idle to infer from these words, that love is the foundation and root of our salvation. Paul does not inquire here, as any one may perceive, on what our salvation is founded, but with what firmness and constancy we ought to continue in the exercise of love.

18. May be able to comprehend. The second fruit is, that the Ephesians should perceive the greatness of Christ’s love to men. Such an apprehension or knowledge springs from faith. By desiring that they should comprehend it with all saints, he shows that it is the most excellent blessing which they can obtain in the present life; that it is the highest wisdom, to which all the children of God aspire. What follows is sufficiently clear in itself, but has hitherto been darkened by a variety of interpretations. Augustine is quite delighted with his own acuteness, which throws no light on the subject. Endeavouring to discover some kind of mysterious allusion to the figure of the cross, he makes the breadth to be love, — the height, hope, — the length, patience, and the depth, humility. This is very ingenious and entertaining: but what has it to do with Paul’s meaning? Not more, certainly, than the opinion of Ambrose, that the allusion is to the figure of a sphere. Laying aside the views of others, I shall state what will be universally acknowledged to be the simple and true meaning.

19. And to know the love of Christ. By those dimensions Paul means nothing else than the love of Christ, of which he speaks afterwards. The meaning is, that he who knows it fully and perfectly is in every respect a wise man. As if he had said, “In whatever direction men may look, they will find nothing in the doctrine of salvation that does not bear some relation to this subject.” The love of Christ contains within itself the whole of wisdom, so that the words may run thus: that ye may be able to comprehend the love of Christ, which is the length and breadth, and depth, and height, that is, the complete perfection of all wisdom. The metaphor is borrowed from mathematicians, taking the parts as expressive of the whole. Almost all men are infected with the disease of desiring to obtain useless knowledge. It is of great importance that we should be told what is necessary for us to know, and what the Lord desires us to contemplate, above and below, on the right hand and on the left, before and behind. The love of Christ is held out to us as the subject which ought to occupy our daily and nightly meditations, and in which we ought to be wholly plunged. He who is in possession of this alone has enough. Beyond it there is nothing solid, nothing useful, — nothing, in short, that is proper or sound. Though you survey the heaven and earth and sea, you will never go beyond this without overstepping the lawful boundary of wisdom.

Which surpasseth knowledge. A similar expression occurs in another Epistle:

“the peace of God, which surpasseth all understanding, shall keep your hearts and minds through Christ Jesus.”
(Philippians 4:7)

No man can approach to God without being raised above himself and above the world. On this ground the sophists refuse to admit that we can know with certainty that we enjoy the grace of God; for they measure faith by the perception of the bodily senses. But Paul justly contends that this wisdom exceeds all knowledge; for, if the faculties of man could reach it, the prayer of Paul that God would bestow it must have been unnecessary. Let us remember, therefore, that the certainty of faith is knowledge, but is acquired by the teaching of the Holy Spirit, not by the acuteness of our own intellect. If the reader desire a more full discussion of this subject, he may consult the “Institutes of the Christian Religion.”

That ye may be filled. Paul now expresses in one word what he meant by the various dimensions. He who has Christ has everything necessary for being made perfect in God; for this is the meaning of the phrase, the fullness of God. Men do certainly imagine that they have entire completeness in themselves, but it is only when their pride is swelled with empty trifles. It is a foolish and wicked dream, that by the fullness of God is meant the full Godhead, as if men were raised to an equality with God.