(19) To know the love of Christ, which passeth knowledge.--The intentional paradox of this expression is weakened if (with many interpretations) we suppose that there is opposition in kind between knowledge referred to in the two clauses: as if "to know" meant to know by faith and spiritual experience, while the "knowledge," which the love of Christ "passes," is mere "human knowledge"--head-knowledge, and the like. Of such opposition there is no trace (contrast 1Corinthians 2:6-16). In the original, the word "to know" is in a tense which expresses cognition in a particular case; hence the meaning of St. Paul's prayer seems to be that they may know from time to time, as each opportunity offers, what must in its entirety pass all human knowledge, either to discover or fully to understand, even when revealing itself; so that they may always go on from faith to faith, from knowledge to knowledge, and yet find new depths still to be fathomed. The "love of Christ" is the love which He bears to us, and which is the motive of His sacrifice for our redemption. It is known only by those who are rooted in love to Him; such love being at once the consequence of the first knowledge of His love to us (1John 4:19) and the condition of entering more deeply into that knowledge.

That ye might be filled with (or, rather, up to) all the fulness of God.--This clause must be taken as dependent, not merely on the clause immediately preceding, but on the whole sentence. It describes the final and glorious consequence of the indwelling of Christ in the heart, viz., the "being filled" with grace "up to the fulness of God." The meaning is more clearly seen in the fuller expression below (Ephesians 4:13): "till we all come . . . to the measure of the stature of the fulness of Christ." It is simply perfect conformation to the image of Him in whom "dwells all the fulness of the Godhead bodily" (Colossians 2:9), and whose fulness is therefore the "fulness of God," manifesting all the attributes of the divine nature. The process is described in 2Corinthians 3:18, "We all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory;" its consummation in 1John 3:2, "When He shall appear, we shall be like Him; for we shall see Him as He is." (Comp. Philippians 3:20-21.) Here it completes the climax. When Christ dwells in the heart we have first, love perfecting the faith which roots the life in Him; next, a thoughtful knowledge, entering by degrees into the unsearchable riches of His love to us; and, lastly, the filling the soul, itself weak and empty, up to the perfection of likeness to Him, so renewing and deepening through all time and eternity the image of God in our humanity.

Verse 19. - And to know the love of Christ, which passeth knowledge. The love here is evidently the love of Christ to us, and this may well be specified as a special matter of prayer. Knowledge of Christ's love, in the sense of an inward personal experience of it - its freeness, its tenderness, its depth, its patience - is the great dynamic of the gospel. This love is transmuted into spiritual force. As the breeze fills the sails and bears forward the ship, so the love of Christ fills the soul and moves it in the direction of God's will. But in its fullness it passeth knowledge; it is infinite, not to be grasped by mortal man, and therefore always presenting new fields to be explored, new depths to be fathomed. That ye may be filled with all the fullness of God; that is, that ye may be filled with spiritual grace and blessing to an extent corresponding to all the fullness of God. Though the finite cannot compare with the infinite, there may be a correspondence between them according to the capacity of each. There is a fullness of gracious attainment in every advanced believer that corresponds to all the fullness of God; every part of his nature is supplied from the Divine fountain, and, so far as a creature can, he presents the image of the Divine fullness. In the human nature of Christ this correspondence was perfect: "In him dwelt all the fullness of the Godhead bodily;" in the soul of the believer there may be a progressive movement towards this fullness. No higher view can be conceived of the dignity of man's nature, and the glorious privileges conferred on him by the gospel, than that he is susceptible of such conformity to God. Who can conceive that man should have attained to such a capacity by a mere process of evolution? "So God made man in his own image;" and in Christ man is "renewed in righteousness and holiness after the image of him who created him."

3:13-19 The apostle seems to be more anxious lest the believers should be discouraged and faint upon his tribulations, than for what he himself had to bear. He asks for spiritual blessings, which are the best blessings. Strength from the Spirit of God in the inner man; strength in the soul; the strength of faith, to serve God, and to do our duty. If the law of Christ is written in our hearts, and the love of Christ is shed abroad there, then Christ dwells there. Where his Spirit dwells, there he dwells. We should desire that good affections may be fixed in us. And how desirable to have a fixed sense of the love of God in Christ to our souls! How powerfully the apostle speaks of the love of Christ! The breadth shows its extent to all nations and ranks; the length, that it continues from everlasting to everlasting; the depth, its saving those who are sunk into the depths of sin and misery; the height, its raising them up to heavenly happiness and glory. Those who receive grace for grace from Christ's fulness, may be said to be filled with the fulness of God. Should not this satisfy man? Must he needs fill himself with a thousand trifles, fancying thereby to complete his happiness?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.