I will not leave you orphans; I will come to you.
Orphanhood is a terrible thing, especially when it comes in the early years of our life. If a young child loses his parents, it is very likely to suffer enough and lacks many things, both material and emotional. Jesus was very much that when he told His disciples what is written in John 14:8. The departure of the Lord to the Father happened when all the apostles were what we now call spiritual babies. So He encouraged them saying that would not leave them orphans. That promise applies fully to us today as well.
I can speak from firsthand about orphanhood. My grandmother, my mother’s mother died at birth my mother. Thus the early years of my mother were very hard and passed from hand to hand, her great-grandmother, grandmother, aunts of his mother until his father, i.e. my grandfather, to the denial of the maternal family of my mother, he decided one day to go find her young daughter to take her to live with him. My grandfather told me he went there on a horse and, without them noticing he put the girl on the animal and escaped with her at full gallop.
Fortunately for my grandfather, at that time there were no current laws, since he had stopped in jail today for what he did for his daughter. But orphanhood in my family does not end there. When I had just two years old my father died and I grew up as the son of a single mother, who was father and mother to me at once. In the absence of a male figure in the home, for me it was very difficult to understand the role of man, because, despite his great effort, my mother could not teach me how to be a man because she was not a man.
I fully understand the great difficulty that we relate to God as our Father when on the natural we have lacked a modeling at home. But I can tell you that Heavenly Father is able to take to overcome that obstacle. He did with me and if you go through a similar situation, so He will do with you too. God will never leave us nor forsake orphans His children in any way. He will always be there, as the best of fathers.
How does God fulfill in us that says John 14:18? In John 1:12 we read how to become a child of God, But as many as received Him, to them He gave the right to become children of God, to those who believe in His name. Receiving Jesus is the requirement to be a child of God and the Bible also testifies that He Himself is the Son of God, as John 3:16 says, For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life.
Now, in John 14:18 it is Jesus himself who tells us not leave us orphans. Some people may ask whether we are children or grandchildren of God because the Son of God is also called Father according to Isaiah 9:6, For unto us a Child is born, unto us a Son is given; and the government will be upon His shoulder. And His name will be called Wonderful, Counselor, Mighty God, Everlasting Father, Prince of Peace.
But we know that the Father and the Son are one, therefore God has no grandchildren. Jesus, the Son, is now seated at the right hand of the Father where He intercedes for us. But He did not leave us orphans because in us dwells the Comforter, the Holy Spirit, who is one with the Father and the Son. And the promise of Jesus Christ includes His return to be with us forever. Who we love, we look forward to his glorious coming. God bless you.