For this cause. His prayers for them are mentioned, not only to testify his regard for them, but likewise to excite them to pray in the same manner; for the seed of the word is scattered in vain, unless the Lord render it fruitful by his blessing. Let pastors learn from Paul's example, not only to admonish and exhort their people, but to entreat the Lord to bless their labors, that they may not be unfruitful. Nothing will be gained by their industry and toil, -- all their study and application will be to no purpose, except so far as the Lord bestows his blessing. This ought not to be regarded by them as an encouragement to sloth. It is their duty, on the contrary, to labor earnestly in sowing and watering, provided they, at the same time, ask and expect the increase from the Lord. We are thus enabled to refute the slanders of the Pelagians and Papists, who argue, that, if the grace of the Holy Spirit performs the whole work of enlightening our minds, and forming our hearts to obedience, all instruction will be superfluous. The only effect of the enlightening and renewing influences of the Holy Spirit is, to give to instruction its proper weight and efficacy, that we may not be blind to the light of heaven, or deaf to the strains of truth. While the Lord alone acts upon us, he acts by his own instruments. It is therefore the duty of pastors diligently to teach, -- of the people, earnestly to receive instruction, -- and of both, not to weary themselves in unprofitable exertions, but to look up for Divine aid. I bow my knees. The bodily attitude is here put for the religious exercise itself. Not that prayer, in all cases, requires the bending of the knees, but because this expression of reverence is commonly employed, especially where it is not an incidental petition, but a continued prayer.

For this cause - Some suppose that this is a resumption of what he had commenced saying in Ephesians 3:1, but which had been interrupted by a long parenthesis. So Bloomfield explains it. But it seems to me more probable that he refers to what immediately precedes. "Wherefore, that the great work may be carried on, and that the purposes of these my sufferings may be answered in your benefit and glory, I bow my knees to God, and pray to him."
I bow my knees - I pray. The usual, and the proper posture of prayer is to kneel; Compare 2-Chronicles 6:13; Daniel 6:10; Luke 22:21; Acts 7:60; Acts 9:40; Acts 20:26; Acts 21:5. It is a posture which indicates reverence, and should, therefore, be assumed when we come before God. It has been an unhappy thing that the custom of kneeling in public worship has ever been departed from in the Christian churches.
Unto the Father of our Lord Jesus Christ - To whom, undoubtedly, prayer should ordinarily be addressed. But this does not make it improper to address the Lord Jesus in prayer; see the notes; 7:59-60 on Acts 1:24.

For this cause I bow my knees - That you may not faint, but persevere, I frequently pray to God, who is our God and the Father of our Lord Jesus. Some very ancient and excellent MSS. and versions omit the words του Κυριου ἡμων Ιησου Χριστου, of our Lord Jesus Christ. And in them the passage reads: I bow my knees unto the Father. The apostle prays to God the Father, that they may not faint; and he bows his knees in this praying. What can any man think of himself, who, in his addresses to God, can either sit on his seat or stand in the presence of the Maker and Judge of all men? Would they sit while addressing any person of ordinary respectability? If they did so they would be reckoned very rude indeed. Would they sit in the presence of the king of their own land? They would not be permitted so to do. Is God then to be treated with less respect than a fellow mortal? Paul kneeled in praying, Acts 20:36; Acts 21:5. Stephen kneeled when he was stoned, Acts 7:60. And Peter kneeled when he raised Tabitha, Acts 9:40.
Many parts of this prayer bear a strict resemblance to that offered up by Solomon, 2-Chronicles 6:1, etc., when dedicating the temple: He kneeled down upon his knees before all the congregation of Israel, and spread forth his hands towards heaven; 2-Chronicles 6:13. The apostle was now dedicating the Christian Church, that then was and that ever should be, to God; and praying for those blessings which should ever rest on and distinguish it; and he kneels down after the example of Solomon, and invokes him to whom the first temple was dedicated, and who had made it a type of the Gospel Church.

(3) For this cause I bow my knees unto the Father of our Lord Jesus Christ,
(3) He teaches by his own example that the efficacy of the doctrine depends upon the grace of God, and therefore we ought to join prayers with the preaching and hearing of the word. And these are needful not only to those who are youngsters in religion, but even to the oldest also, that as they grow up more and more by faith in Christ, and are confirmed with all spiritual gifts, they may be grounded and rooted in the knowledge of that immeasurable love, with which God the Father has loved us in Christ. And this is because the whole family, of which a part is already received into heaven, and part is yet here on earth, depends upon that adoption of the heavenly Father, in his only Son.

For this cause I bow my knees unto the Father,.... That is, pray unto him for the perseverance of the saints; for nothing is more desirable to the ministers of Christ than that; which is the pure gift of God, and is what he has promised, and therefore should be prayed to for it; for what God has designed and promised to his people, he will be sought to; and the apostle's view might be also to stir up these saints to pray for themselves: the gesture he used in prayer was bowing the knees; a man is not tied to any particular gesture or posture in prayer, the main thing is the heart; mere postures and gestures are insignificant things with God; though where the mind is affected, the body will be moved; and this gesture may be expressive of reverence, humility, and submission in prayer: the object he prayed unto is the Father; that is, as follows,
of our Lord Jesus; though these words are wanting in the Alexandrian copy, and Ethiopic version, yet are rightly retained in others; for God is the Father of Christ, not by creation, nor adoption, but by generation, being the only begotten of the Father; and as such he is rightly prayed to, since not only Christ prayed to him as such; but he is the Father of his people in and through Christ; and there is no other way of coming to him but by Christ; and all spiritual blessings come though Christ, and from God, as the Father of Christ.

For this cause--Resuming the thread of Ephesians 3:1, "For this cause." Because ye have such a standing in God's Church [ALFORD].
bow my knees--the proper attitude in humble prayer. Posture affects the mind, and is not therefore unimportant. See Paul's practice (Acts 20:36); and that of the Lord Himself on earth (Luke 22:41).
unto the Father--The oldest manuscripts omit "of our Lord Jesus Christ." But Vulgate and some very old authorities retain them: Ephesians 3:15, "From whom," in either case, refers to "the Father" (Patera), as "family" (patria, akin in sound and etymology) plainly refers to Him. Still the foundation of all sonship is in Jesus Christ.

For this cause I. See Ephesians 3:1. He now resumes the thought of that verse.
Bow my knees. In the attitude of prayer.
Unto the Father. The Fountain of all mercies. The words, "Of our Lord Jesus Christ," are not found in the best manuscripts and are omitted in the Revision.
Of whom. The Father is referred to.
The whole family in heaven and earth. In the Revision, "Every family." The idea is that the Father is the Father of all the families of his children, whether Jews or Gentiles on earth, or in heaven. He is "Our Father in heaven" to the believer of every race, in this world or the world to come. All, as far as creation is concerned, derive their being from him, like children from a parent, and all the good are his spiritual children.