The fourteenth chapter of the Gospel according to John is a conversation of Jesus with His disciples about His early departure to heaven and the concern that the eleven had for Jesus’ departure and their future. This chapter also teaches us the promises of Jesus for His church and that He is with us until the end.
The disciples were worried because Christ’s departure was approaching, and it was not for less, because, next to Jesus they saw things that they had never seen or felt, and they are seeing how soon all that will go away, but this was not true, since that the work that Christ had begun He would also finish it.
16 And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever;
17 Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.
18 I will not leave you comfortless: I will come to you.
19 Yet a little while, and the world seeth me no more; but ye see me: because I live, ye shall live also.
John 14:16-19 (KJV)
The disciples should not be worried, so Jesus tells them that He will beg the Father and give them another Comforter to be with them “forever.” This is a great promise, since not everyone possessed the Holy Spirit in the Old Testament, but it was on the prophets of God, but now, Jesus is telling them that He would give His Spirit to accompany them and not be alone never.
Jesus began a work in us and He has to finish it, which means we should not be worried, because we are not alone. He accompanies us every moment of our lives, until the end, and this is a promise that everyone who keeps His commandments has.