27 Peace I leave with you, My peace I give to you; not as the world gives do I give to you. Let not your heart be troubled, neither let it be afraid.
28 You have heard Me say to you, 'I am going away and coming back to you.' If you loved Me, you would rejoice because I said, 'I am going to the Father,' for My Father is greater than I.
29 "And now I have told you before it comes, that when it does come to pass, you may believe.
30 I will no longer talk much with you, for the ruler of this world is coming, and he has nothing in Me.
31 But that the world may know that I love the Father, and as the Father gave Me commandment, so I do. Arise, let us go from here."
Peace (v.27) — First usage is reconciliation with God through Christ's death (Colossians 1:20; Romans 5:1). Second usage is peace through the Spirit (Philippians 4:17; Isaiah 26:3). The immediate application for both would be in the days and weeks that followed after Christ said this to the disciples (John 20:19).
not as the world gives (v.27) — The world talks of peace and offers it, but can't deliver (1 Thessalonians 5:3)
you have heard Me say (v.28) — referring back to John 13:33-36; 14:2-3,12
you would rejoice (v.28) — Rather than being sad, the disciples should have been happy for Christ because He was returning to the Father.
My Father is greater than I (v.28) — Not in His Godhead (Philippians 2:6-8) but in His humanity and servanthood
ye may believe (v.29) — that He was God, Messiah, Savior, truth
ruler of this world (v.30) — Satan, who has the power of death (Hebrews 2:14) but would not prevail over Christ. When Christ went to the Cross, it appeared that Satan was in control, but actually the Father was.
has nothing in Me (v. 30) — Christ is holy. There is nothing in Him that Satan can influence, appeal or control.
Verses 30 and 31 can be summed up as "Satan has no power over Me, but I love the Father and do what I am about to do (His death) for Him. Get up. It's time to go do what must be done."