Our first passage is:
These verses are found in the Gospels and were written by the Apostle John. It was written around 85-90 AD. It is within the boundary of Christ's private ministry to his own, the Believers.
From the Scofield Study Bible:
(vs. 16) The word comforter is the translation of the Greek word parakletos meaning: one called alongside to help, a consoler. It is also translated as an advocate. Christ is the Christian's paraclete with the Father when the Christian sins; the Holy Spirit is the Christian's indwelling paraclete to help his ignorance and infirmity, and to make intercession. (Rom. 8:26-27)
(vs. 20) The new relationship described in the words "ye in me, and I in you" introduces the New Testament mystery of the body of Christ. The position of the Church in Christ, as composed of members of His body and the truth of Christ as indwelling the believer are central features in the Pauline doctrine of the Church, and are here revealed to the disciples for the first time by Christ.
From The MacArthur Study Bible:
(vs. 16) The priestly and intercessory work of Christ began with the request that the Father send the Holy Spirit to indwell in the people of faith. The word another means another of the same kind, i.e. someone like Jesus Himself who will take His place and do His Work. The Spirit of Christ is the Third Person of the Trinity, having the same essence of deity as Jesus and as perfectly one with Him as He is with the Father. Helper means "one called alongside to help" and has the idea of someone who encourages and exhorts. "Be with you" has to do with His permanent residence in believers.
(vs. 17) He is the Spirit of truth in that He is the source of truth and communicates the truth to His own. Apart from Him, people cannot know God's truth. Abides with you and will be in you indicate some distinction between the ministry of the Holy spirit to believers before and after Pentecost. While clearly the Holy Spirit has been with all who have ever believed throughout redemptive history as the source of truth, faith, and life, Jesus is saying something new is coming in His ministry.
(vs. 18) In this veiled reference to His death, Jesus promised not to leave them alone.
(vs. 18,19) First, He was referring to His resurrection, after which they would see Him. There is no record that any unbelievers saw Him after he rose. In another sense, this has reference to the mystery of the Trinity. Through the coming and indwelling of the Holy Spirit at Pentecost, Jesus would be back with His children.
(vs. 19) Because of His resurrection and by the indwelling life of the Spirit of Christ, believers possess eternal life.
(vs. 20) In that day refers to His resurrection when He returns to them alive.
I pray that you will have the desire to hide His words in your heart so that you may recall them when needed. These verses speak to me and remind me that I am His, He is mine and that He will never leave me.