John, the Evangelist, eloquently launched his gospel with the doctrine of The Word Incarnate. John 1:1-4

"In the beginning was the Word, and the Word was with God, and the Word was God.  The same was in the beginning with God.  All things were made by Him; and without Him was not any thing made that was made. In Him was life; and the life was the light of men."
John's style of writing is captivating.  Whereas the other evangelists reported Christ's events, John narrated his testimony with genuine love of an intimate witness 
The emotion of Christ is described by John the Evangelist in exceptional language regarding Lazarus Christ experiences again what it feels to be human in losing Lazarus: the reality of death. John describes Christ as being "deeply moved in His spirit", "greatly troubled". This disturbance is quite real, not for the gallery of onlookers. It is at this place of grief that we listen to John's narration, one that is not in the other gospels.  

Christ imparted an intimate "selective love", or cherishing, toward John, more so than for any of the others. 

John, and his brother James, and also Peter, became Christ's inner circle of apostles; but it was John, whom Christ loved the most.
" 'Amen, Amen, I say to you, one of you is going to betray me.' The disciples looked at one another: they did not actually know of whom he was speaking.  There was one reclining at table, in the bosom of Jesus, one of his disciples.  It was the one whom Jesus loved.  Simon Peter then signaled to this disciple and said to him: 'Try to find out of whom He speaks'.  That disciple leaning very close to the breast of Jesus, asked of Him: 'Lord, who is it?' "

The writing of John, the Elder, is deeply spiritual.  John was given the divine gift of writing as a witness to Christ, long after the Lord's death, when John was in exile.  

John, profound and exact, wrote the fourth gospel, three epistles, and the Book of Revelation, with inspirational eloquence

The Book of Revelation was written by John when he was an elderly man

 "The revelation of Jesus Christ, which God gave him to show his servants what must soon take place; he made it known by sending his angel to his servant John, who testified to the word of God and to the testimony of Jesus Christ, even to all that he saw. Blessed is the one who reads aloud the words of the prophecy, and blessed are those who hear and who keep what is written in it; for the time is near. "  Revelation 1: 1-3

And Jesus said to them:

"My sheep hear my voice, and I know them, and they follow me.
I give them eternal life, and they will never perish, and no one will snatch them out of my hand. My Father, who has given them to me is greater than all, and no one is able to snatch them out of the Father's hand. I and the Father are one.” John 10:27-30

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