Such rich teaching! Jesus begins to reveal His plan: to die for the sins of mankind.
 “I am the good shepherd. The good shepherd lays down his life for the sheep.
 just as the Father knows me and I know the Father—and I lay down my life for the sheep.
 The reason my Father loves me is that I lay down my life—only to take it up again.
Verse 17 reveals what CS Lewis refers to as “the deeper magic,” and that is “to take it [his life] up again.”
 No one takes it from me, but I lay it down of my own accord. I have authority to lay it down and authority to take it up again. This command I received from my Father.”
Had we ears to hear what He was saying, we would not have been surprised by what happened at the cross and then the tomb. But as God told Isaiah, “Go and tell this people:
“‘Be ever hearing, but never understanding; be ever seeing, but never perceiving.’  Make the heart of this people calloused;
make their ears dull and close their eyes. Otherwise they might see with their eyes,
hear with their ears, understand with their hearts,
and turn and be healed.” Isaiah 6:9-10
There was a reason for this veil. The enemy could not catch wind of what He was doing. 1 Corinthians 2:8 says, “None understood it, for if they had, they would not have crucifed the Lord of glory.”
There is another part of the plan that He reveals in this passage, which is to combine the Gentiles and Israel into one unit.
 I have other sheep that are not of this sheep pen. I must bring them also. They too will listen to my voice, and there shall be one flock and one shepherd.
Galatians 3:14 He redeemed us in order that the blessing given to Abraham might come to the Gentiles through Christ Jesus, so that by faith we might receive the promise of the Spirit.
 You are all sons of God through faith in Christ Jesus,
 for all of you who were baptized into Christ have clothed yourselves with Christ.  There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus.
Ephesians 2:14b His purpose was to create in himself one new man out of the two [Jews and Gentiles] thus making peace,
As a Gentile, I am certainly glad that Christ fulfilled His plan. And I have great certainty that He will fulfill the rest of His plan: