Haydock's Catholic Bible Commentary: John
Ver. 19. The world seeth me no more, after my death; but you shall see me, conversing with you for forty days, after my resurrection. (Witham)
Ver. 20. In that day, when I am risen again, or when the Holy Ghost is come, you shall know that I am in the Father, and how, and in what manner: as also, how I am in you, and you in me. Our Saviour Christ, on several occasions, speaks of different ways of being united, or of being one; as first, of being one in nature and substance, and by such an union, as agrees only with the divine persons, who are one in all things. 2ndly, Persons may be one, or united in affection and love, which also, as to its most perfect manner, agrees only with the three divine persons; but a similitude, and an imitation of this union of love, is found among creatures, both when they love God, and when for God's sake, they love one another: yet these unions are as different as God, and his creatures. The Arians and Socinians lay hold on these expressions, and of the words, (chap. xvii. ver. 21.) when Christ prays, that his disciples may be one, as he and his Father are one, which words imply no more than a similitude, and an imitation of that union of love (with which the three divine persons love one another) though at an infinite distance. If the old or new Arians examined, with a sincere desire of finding the truth (which they ought to seek from many passages in the New Testament, as well as from the sense and tradition of the Church, guided by the promised Spirit of Truth) they might certainly find how different is the union of nature and substance of the eternal Son with his eternal Father, and of that union of the three divine persons, when they are said to be one, from that inferior and lesser union of love and affection, by which either God loves his adoptive children, his faithful servants, or they love one another: they would easily discover, that many things are said of the unity and union of the divine persons, which could not be true, unless they were one and the same God, coeternal and consubstantial, which by no means can be said of God and his creatures, nor of the union of affection only, by which the creatures love one another. (Witham)
Ver. 21. Now that Christ in this place speaks only of this imperfect union of affection, appears by the following words: he that keepeth my commandments, loveth me: and he that loveth me, shall be loved by my Father, and I will love him, and I will manifest myself to him: that is, by particular graces and favours, and by a recompense of glory in the next life. (Witham)
Ver. 22-25. Lord, how is it? Literally, what is done, or, what will be done, that thou art about to manifest thyself to us, and not to the world? This apostle imagined, that the Messias would make manifest his glory of a temporal kingdom, not to them only, but to all the world. But Christ, by his answer, lets him know, that he spoke only of a manifestation of his love to those that loved him. If any man love me, my Father will love him, and we will come to him, that is, the three divine persons, will come to his soul, in a special manner, so as to bless him with an infusion of graces, and make our abode in his soul. (Witham)
Ver. 26. The Paraclete, the Holy Ghost, whom the Father will send in my name, as proceeding also from me: and therefore Christ saith, in the next chapter, (ver. 26) that he himself will send him from the Father. He will teach you all things, &c. He will give you a more perfect knowledge of all those truths, which I have taught you. (Witham) --- Teach you all things. Here the Holy Ghost is promised to the apostles, and their successors, particularly, in order to teach them all truth, and to preserve them from error. (Challoner) --- The Scripture, in different places, remarks, that the apostles did not understand the accomplishment of prophecies, as soon as they were fulfilled. (Luke xxiv. 27.) They could not draw the comparison between the actions of our Saviour, and the figures of the old law: but no sooner had the Holy Ghost descended upon them, than they explained the Scriptures, their hearts and eyes being opened and enlightened by the light of the Holy Spirit. (Calmet) --- See chap. xvi. ver. 12. and 13.
Ver. 28. The Father is greater than I.[3] According to the common exposition, Christ here speaks of himself, as made man, which interpretation is drawn from the circumstances of the text, Christ being at that time, going to suffer, and die, and shortly after to rise again, and ascend into heaven, all which agree with him, as man, and according to his human nature. But the Arians can take no advantage from these words, (though with divers of the ancient Fathers, we should allow them to be spoken of Christ, as the Son of God:) the Father may be said in some manner to be greater than the Son, if we consider the order of the divine processions, that is, that the Father is the first person, and proceeds from no other; whereas the Son proceeds from the Father. If any one, says St. Chrysostom, will contend, that the Father is greater, inasmuch as he is the cause, from which the Son proceedeth, we will bear with him, and this way of speaking: provided he grant that the Son is not of a different substance, or nature. St. Athanasius allows the same, and takes notice, that though the Father is said to be greater, yet he is not said to be better, nor more excellent, than the Son; because they are one and the same in substance, nature, and other perfections. (Witham) --- The enemies of the divinity of Christ here triumph, and think they have the confession of Christ himself, that he is less than the Father. But if they would distinguish the two natures of Christ, their arguments would all fall to the ground. Jesus Christ, as man, and a creature, is inferior to his Father, the Creator; but, as God, he is, in every respect, equal to him. (St. Basil, St. Augustine, &c.) --- Others, likewise, answer it thus: Following the confused opinion of the world, and even of the apostles themselves, who as yet only considered Christ as a prophet, and as a man, eminent in virtue and sanctity, he was less than the Father. (St. Chrysostom; Leont.; Theophylactus; Euthymius) --- And likewise the title of Father, (as we generally use the word) is greater, and much more honourable, than that of Son; and in this respect, Christ is inferior to his Father. (St. Athanasius; St. Hilary; St. Epiphanius; St. Gregory of Nazianzus; and St. Cyril) --- But this appellation, though really true, does not destroy the equality of the persons, because Christ has declared, in numerous other places, that he is equal to the Father; that he is in the Father; and that he and the Father are one.