John 16:7

"But I tell you the truth." Observe how He consoleth them again. "I speak not," He saith, "to please you, and although you be grieved ten thousand fold, yet must ye hear what is for your good; it is indeed to your liking that I should be with you, but what is expedient for you is different. And it is the part of one caring for others, not to be over gentle with his friends in matters which concern their interests, or to lead them away from what is good for them." "For if I go not away, the Comforter will not come." What here say those who hold not the fitting opinion concerning the Spirit? Is it "expedient" that the master depart, and the servant come? Seest thou how great is the honor of the Spirit? "But if I depart, I will send Him unto you."

And then He adds, "Nevertheless I tell you the truth, it is expedient for you that I go away. For if I go not away, the Comforter will not come unto you; but if I depart, I will send Him unto you:" as if He had said, It is expedient for you that this form of a servant be taken away from you; as the Word made indeed flesh I dwell among you; but I would not that ye should continue to love me carnally, and, content with such milk, desire to remain infants always. "It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you." If I withdraw not the tender nutriment wherewith I have nourished you, ye will acquire no keen relish of solid food; if ye adhere in a carnal way to the flesh, ye will not have room for the Spirit. For what is this, "If I go not away, the Comforter will not come unto you; but if I depart, I will send Him unto you"? Was it that He could not send Him while located here Himself? Who would venture to say so? Neither was it, that where He was, thence the Other had withdrawn, or that He had so come from the Father as that He did not still abide with the Father. And still further, how could He, even when having His own abode on earth, be unable to send Him, who we know came and remained upon Him at His baptism; yea, more, from whom we know that He was never separable? What does it mean, then, "If I go not away, the Comforter will not come unto you;" but that ye cannot receive the Spirit so long as ye continue to know Christ after the flesh? Hence one who had already been made a partaker of the Spirit says, "Though we have known Christ after the flesh, yet now henceforth know we Him no more." For now even the very flesh of Christ he did not know in a carnal way, when brought to a spiritual knowledge of the Word that had been made flesh. And such, doubtless, did the good Master wish to intimate, when He said, "If I go not away, the Comforter will not come unto you; but if I depart, I will send Him unto you."

But with Christ's bodily departure, both the Father and the Son, as well as the Holy Spirit, were spiritually present with them. For had Christ departed from them in such a sense that it would be in His place, and not along with Him, that the Holy Spirit would be present in them, what becomes of His promise when He said, "Lo, I am with you always, even to the end of the world;" and, I and the Father "will come unto him, and will make Our abode with him," seeing that He also promised that He would send the Holy Spirit in such a way that He would be with them for ever? In this way it was, on the other hand, that seeing they were yet out of their present carnal or animal condition to become spiritual, with undoubted certainty also were they yet to have in a more comprehensive way both the Father, and the Son, and the Holy Spirit. But in no one are we to believe that the Father is present without the Son and the Holy Spirit, or the Father and the Son without the Holy Spirit, or the Son without the Father and the Holy Spirit, or the Holy Spirit without the Father and the Son, or the Father and the Holy Spirit without the Son; but wherever any one of Them is, there also is the Trinity, one God. But here the Trinity had to be suggested in such a way that, although there was no diversity of essence, yet the personal distinction of each one separately should be presented to notice; where those who have a right understanding can never imagine a separation of natures.

(Tr. xciv) But our Lord saw what effect His words would produce upon their minds. Not having yet that inward consolation which the Holy Ghost was to impart, they were afraid to lose the outward presence of Christ, and so, when they could no longer doubt from His own words that they were going to lose Him, their human affections were saddened, for the loss of their visible object. Wherefore it follows; But because I have said these things unto you, sorrow hath filled your heart. But He knew that it would be for their good, forasmuch as that inward sight wherewith the Holy Ghost would console them, was the better one: Nevertheless I tell you the truth; It is expedient for you that I go away.

(i. de Trin. c. 9.) This He says not on account of any inequality between the Word of God and the Holy Ghost, but because the presence of the Son of man amongst them would impede the coming of the latter. For the Holy Ghost did not humble Himself as did the Son, by taking upon Him the form of a servant. It was necessary therefore that the form of the servant should he removed from their eyes; for so long as they looked upon that, they thought that Christ was no more than what they saw Him to be. So it follows: But if I depart, I will send Him unto you.