John 14:20

(Hom. lxxv. 2) Or, in that day, on which I shall rise again, ye shall know. For His resurrection it was that established their faith. Then the powerful teaching of the Holy Spirit began. His saying, I am in the Father, expresses His humility; the next, And ye in Me, and I in you, His humanity and God's assistance to Him. Scripture often uses the same words in different senses, as applied to God and to men.

When someone sweeps clean their soul in the name of Christ, Christ dwells in them and God dwells in Christ. From that time onward, that person becomes one of three persons—himself; Christ, who dwells in him; and God, who dwells in Christ.

Then, he says, from these facts only you will learn that what I said to you was true about which you now have your doubts. I said, "I am in my Father" concerning the equality of nature and the inseparable connection when I will appear …

"In that day you shall know that I am in My Father," that is, when I rise again, then you shall know that I am not separated from the Father, but have one and the same power. "And you in Me," that is, kept by …

On that day you will know that I am in my Father: in which is noted the distinction of persons and the unity of essence; which pertains to the faith of the Trinity; and you in me, and I in you, through grace, and this …

By love, and the observance of His commandments, that will be perfected in us which He has begun, viz. that we should be in Him, and He in us. And that this blessedness may be understood to be promised to all, not to the Apostles only, He adds, He that hath My commandments and keepeth them, he it is that loveth Me.

Now we see the fruit of his return, which is the knowledge of those things which the apostles did not know. For, as we saw, Peter did not know where Christ was going, and so he asked: "Lord, where are you going?" (13:36); and Thomas …

At that day ye shall know,....

That I am in my Father - After my resurrection, ye shall be more fully convinced of this important truth, that I and the Father are One; for I will live in you by the energy of my Spirit, and ye shall live in me by faith, love, and obedience.

The short passage before us is singularly rich in "precious promises." Twice our Lord Jesus Christ says, "I will." Twice He says to believers, "You shall." We learn from this passage, that Christ's second coming is meant to be the special comfort of believers. He says to His disciples, "I will not leave you comfortless—I will come to you." Now what is the "coming" here spoken of? It is only fair to say that this is a disputed point among Christians. Many refer it to our Lord's coming to His disciples after His resurrection.

I will not leave you comfortless--in a bereaved and desolate condition; or (as in Margin) "orphans." I will come to you--"I come" or "am coming" to you; that is, plainly by the Spirit, since it was to make His departure to be no bereavement.

The short passage before us is singularly rich in "precious promises." Twice our Lord Jesus Christ says, "I will." Twice He says to believers, "You shall." We learn from this passage, that Christ's second coming is meant to be the special comfort of believers. He says to His disciples, "I will not leave you comfortless—I will come to you." Now what is the "coming" here spoken of? It is only fair to say that this is a disputed point among Christians. Many refer it to our Lord's coming to His disciples after His resurrection. Many refer it to His invisible coming into the hearts of His people by the grace of the Holy Spirit. Many refer it to His coming by the outpouring of the Holy Spirit on the day of Pentecost. It may well be doubted, however, whether any one of these three views conveys the full meaning of our Lord's words, "I will come." The true sense of the expression appears to be the second personal coming of Christ at the end of the world. It is a wide, broad, sweeping promise, intended for all believers, in every age, and not for the Apostles alone—"I will not stay always in heaven—I will one day come back to you." It is like the message which the angels brought to the disciples after the ascension—"This same Jesus shall come in like manner as you have seen Him go." (Acts. 1:11.) It is like the last promise which winds up the Book of Revelation—"Surely I come quickly." (Rev. 22:20.) Just in the same way the parting consolation held out to believers, the night before the crucifixion, is a personal return—"I will come." Let us settle it in our minds that all believers are comparatively "orphans," and children in their minority, until the second advent. Our best things are yet to come. Faith has yet to be exchanged for sight, and hope for certainty. Our peace and joy are at present very imperfect. They are as nothing to what we shall have when Christ returns.

At that day - In the time when my life shall be fully manifested to you, and you shall receive the assurance that I live. This refers to the time after his resurrection, and to the manifestations which in various ways he would make that he was alive. That I am in my “Father ... - That we are most intimately and indissolubly united. See the notes at Joh 10:38. Ye in me - That there is a union between us which can never be severed. See the notes at Joh 15:1-7.