(15)If you love me you will keep my commandments. (16)And I will ask the Father and he will give to you another Paraclete, so that it may be with you into eternity, (17)the Spirit of truth, whom the world is not able to receive because it does not see him* nor does it know him*. You know him*, because he* abides in your presence and will be in you. (18)I will not leave you as orphans, I am coming to you. (19)Yet in a little while the world will no longer see me, but you will see me; because I live you also will live. (20)In that day you will know that I am in my Father and you in me and I in you. (21)Those who have the commandments and keep them, they are the ones who love me. And the ones who love me will be loved by my Father and I will love them and I will reveal myself to them.
*Though I am not sure it is theologically accurate to call the Paraclete a "he," the Greek uses a neuter pronoun, and there doesn't seem to be a good English alternative. I suppose I could call the Paraclete "it," but that gets redundant to a point. I apologize for the political incorrectness, and I'm open to other translation possibilities--so leave a comment!
I think this Scripture addresses every human being's most primal fear: separation. At some level, we have all been afraid of being separated from those we love. There's the fear of physical separation, like getting lost in the grocery store as a child or fearing that someone may abduct you. Then there's everyone's fear that their parent, grandparent, spouse or best friend might die and leave them alone in the world. Certainly this thought must have crossed the disciples' minds a time or two as Jesus' teachings continued to cause outrage.
But Jesus says that there is no need to be afraid of being alone. Jesus will never let that happen. Verse 18 is probably my favorite. The Greek literally reads "I will not allow you [to be] orphans." It might not be that Jesus is physically very near, but another Paraclete is coming!
Being alone is one thing. It seems unlikely that any of us should be absolutely alone, without any human contact, for very long. But being loved by those that share your company--that is something totally different. But Jesus even promises that love will continue. In verse 21 he says that those who follow the commandments (which are not restrictive rules, but life giving--another blog altogether!) will be loved. Not just loved by Jesus, but by the Father as well.
The only thing worse than feeling alone is feeling alone and unloved because when you feel alone and unloved you're pretty sure you don't matter to anyone else. The wonderful gift Jesus gave his followers was assurance that this would never happen. Even when Jesus died, the disciples were not alone or unloved. Even today, the many disciples of Jesus are not alone or unloved. To my way of thinking, that alone is a tremendous gift of life!