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.

And to know the love of Christ - The love of Christ toward us; the immensity of redeeming love. It is not merely the love which he showed for the Gentiles in calling them into his kingdom, which is here referred to; it is the love which is shown for the lost world in giving himself to die. This love is often referred to in the New Testament, and is declared to surpass all other which has ever been evinced; see the Romans 5:7-8, notes; John 15:13, note. To know this; to feel this; to have a lively sense of it, is one of the highest privileges of the Christian. Nothing will so much excite gratitude in our hearts; nothing will prompt us so much to a life of self-denial; nothing will make us so benevolent and so dead to the world; see the notes on 2-Corinthians 5:14.
Which passeth knowledge - There "seems" to be a slight contradiction here in expressing a wish to know what cannot be known, or in a desire that they should understand that which cannot be understood. But it is the language of a man whose heart was full to overflowing. He had a deep sense of the love of Christ, and he expressed a wish that they should understand it. Suddenly he has such an apprehension of it, that he says it is indeed infinite. No one can attain to a full view of it. It had no limit. It was unlike anything which had ever been evinced before. It was love which led the Son of God to become incarnate; to leave the heavens: to be a man of sorrows; to be reviled and persecured; to be put to death in the most shameful manner - on a cross. Who could understand that? Where else had there been anything like that? What was there with which to compare it? What was there by which it could be illustrated? And how could it be fully understood Yet "something" of it might be seen, known, felt; and the apostle desired that as far as possible they should understand that great love which the Lord Jesus had manifested for a dying world.
That ye might be filled with all the fulness of God - What an expression! How rich and glorious Who can comprehend all that it implies? Let us inquire into its meaning. There "may" be here in these verses an allusion to the "temple." The apostle had spoken of their being founded in love, and of surveying the length, and breadth, and depth, and height of that love, as of a vast and splendid edifice, and he now desires that those whom he addressed might be pervaded or filled with the indwelling of God. The language here is cumulative, and is full of meaning and richness.
(1) they were to be "full of God." That is, he would dwell in them.
(2) they were to be filled with "the fulness of God" - τὸ πλήρωμα τοῦ Θεοῦ to plērōma tou Theou. On the word rendered "fulness," see on Ephesians 1:10, note, 23, note. It is a favorite word with Paul. Thus, he speaks of the "fulness" of the Gentiles, Romans 11:25; the "fulness" of time, Galatians 4:4; the fulness of him that filleth all in all, Ephesians 1:23; the "fulness" of Christ, Ephesians 4:13; the "fulness" of the Godhead in Christ, Colossians 1:19; Colossians 2:9. It means here, "that you may have the richest measures of divine consolation and of the divine presence; that you may partake of the entire enjoyment of God in the most ample measure in which he bestows his favors on his people."
(3) it was to be with "all" the fulness of God; not with partial and stinted measures of his gracious presence, but with "all" which he ever bestows. Religion is not a name. It is not a matter of form. It is not a trifle. It is the richest, best gift of God to man. It ennobles our nature. It more clearly teaches us our true dignity than all the profound discoveries which people can make in science; for none of them will ever fill us with the fulness of God. Religion is spiritual, elevating, pure, Godlike. We dwell with God; walk with God; live with God; commune with God; are like God. We become partakers of the divine nature 2-Peter 1:4; in rank we are associated with angels; in happiness and purity we are associated with God!

To know the love of Christ, which passeth knowledge - It is only by the love of Christ that we can know the love of God: the love of God to man induced him to give Christ for his redemption; Christ's love to man induced him to give his life's blood for his salvation. The gift of Christ to man is the measure of God's love; the death of Christ for man is the measure of Christ's love. God so loved the world, etc. Christ loved us, and gave himself for us.
But how can the love of Christ, which passeth knowledge, be known? Many have labored to reconcile this seeming contradiction. If we take the verb γνωναι in a sense in which it is frequently used in the New Testament, to approve, acknowledge, or acknowledge with approbation, and γνωσις to signify comprehension, then the difficulty will be partly removed: "That ye may acknowledge, approve, and publicly acknowledge, that love of God which surpasseth knowledge." We can acknowledge and approve of that which surpasses our comprehension. We cannot comprehend God; yet we can know that he is; approve of, love, adore, and serve him. In like manner, though we cannot comprehend, the immensity of the love of Christ, yet we know that he has loved us, and washed us from our sins in his own blood; and we approve of, and acknowledge, him as our only Lord and Savior. In this sense we may be said to know the love of Christ that passeth knowledge.
But it is more likely that the word γνωσις, which we translate knowledge, signifies here science in general, and particularly that science of which the rabbins boasted, and that in which the Greeks greatly exulted. The former professed to have the key of knowledge; the secret of all Divine mysteries; the latter considered their philosophers, and their systems of philosophy, superior to every thing that had ever been known among men, and reputed on this account all other nations as barbarians. When the apostle prays that they may know the love of Christ which passeth knowledge, he may refer to all the boasted knowledge of the Jewish doctors, and to all the greatly extolled science of the Greek philosophers. To know the love of Christ, infinitely surpasseth all other science. This gives a clear and satisfactory sense.
That ye might be filled with all the fullness of God - Among all the great sayings in this prayer, this is the greatest. To be Filled with God is a great thing; to be filled with the Fulness of God is still greater; but to be filled with All the fullness of God, παν το πληρωμα του Θεου, utterly bewilders the sense and confounds the understanding.
Most people, in quoting these words, endeavor to correct or explain the apostle, by adding the word communicable; but this is as idle as it is useless and impertinent. The apostle means what he says, and would be understood in his own meaning. By the fullness of God, we are to understand all those gifts and graces which he has promised to bestow on man, and which he dispenses to the Church. To be filled with all the fullness of God, is to have the whole soul filled with meekness, gentleness, goodness, love, justice, holiness, mercy, and truth. And as what God fills, neither sin nor Satan can fill; consequently, it implies that the soul shall be emptied of sin, that sin shall neither have dominion over it, nor a being in it. It is impossible for us to understand these words in a lower sense than this. But how much more they imply, (for more they do imply), I cannot tell. As there is no end to the merits of Christ, no bounds to the mercy and love of God, no limits to the improvability of the human soul, so there can be no bounds set to the saving influence which God will dispense to the heart of every believer. We may ask, and we shall receive, and our joy shall be full.

And to know the (k) love of Christ, which (l) passeth knowledge, that ye might be filled with all the (m) fulness of God.
(k) Which God has shown us in Christ.
(l) Which surpasses all the capacity of man's intellect, to comprehend it fully in his mind: for otherwise whoever has the Spirit of God perceives as much (according to the measure that God has given him) as is necessary for salvation.
(m) So that we have abundantly in us whatever things are required to make us perfect with God.

And to know the love of Christ, which passeth knowledge,.... The love of Christ to his own, to his church and people, is special and peculiar; free and Sovereign; as early as his Father's love, and is durable and unchangeable; the greatest love that ever was heard of; it is matchless and unparalleled; it is exceeding strong and affectionate, and is wonderful and surprising: the instances of it are, his engaging as a surety for them; his espousing both their persons and their cause; his assumption of their nature; his dying in their room and stead; his payment of their debts, atoning for their sins, and bringing in for them an everlasting righteousness; his going to prepare a place for them in heaven; his intercession for them there; his constant supply of all their wants, and the freedom and familiarity he uses them with. The saints have some knowledge of this love, some tastes of it; their knowledge is a feeling and experimental one, fiducial and appropriating, and what influences their faith, and love, and cheerful obedience, but it is but imperfect; though the knowledge they have of it is supereminent, it exceeds all other knowledge, yet this love passes knowledge; not only the knowledge of natural men, who know nothing of it, but the perfect knowledge of saints themselves, in the present life, and of angels also, who desire to look into it, and the mysteries of it; and especially it is so as to some instances of it, such as the incarnation of Christ, his becoming poor who was Lord of all, being made sin, and a curse, and suffering, the just for the unjust. Now the apostle prays, that these saints might know more of this love; that their knowledge, which was imperfect, might be progressive.
That ye might be filled with all the fulness of God; this is the last petition, and is to be understood, not of a full comprehension of the divine Being, nor of a communication of his divine perfections, nor of having in them the fulness of grace, which it has pleased God should dwell in Christ; but either of that fulness of good things, which they may receive from God in this life; as to be filled with a sense of the love and grace of God; with satisfying views of interest in the righteousness of Christ; with the Spirit, and the gifts and graces thereof; with full provisions of food for their souls; with spiritual peace, joy, and comfort; with knowledge of divine things, of God in Christ, of Christ, of the Gospel, and of the will of God; and with all the fruits or righteousness, or good works springing from grace; or else of that fulness which they shall receive hereafter, even complete holiness, perfection of knowledge, fulness of joy and peace, entire conformity to God and Christ, and everlasting communion with them.

passeth--surpasseth, exceeds. The paradox "to know . . . which passeth knowledge," implies that when he says "know," he does not mean that we can adequately know; all we know is, that His love exceeds far our knowledge of it, and with even our fresh accessions of knowledge hereafter, will still exceed them. Even as God's power exceeds our thoughts (Ephesians 3:20).
filled with--rather, as Greek, "filled even unto all the fulness of God" (this is the grand goal), that is, filled, each according to your capacity, with the divine wisdom, knowledge, and love; "even as God is full," and as Christ who dwells in your hearts, hath "all the fulness of the Godhead dwelling in Him bodily" (Colossians 2:9).

And to know - But the apostle corrects himself, and immediately observes, it cannot be fully known. This only we know, that the love of Christ surpasses all knowledge. That ye may be filled - Which is the sum of all. With all the fulness of God - With all his light, love, wisdom, holiness, power, and glory. A perfection far beyond a bare freedom from sin.