“And I will pray the Father, and He will give you another Helper, that He may abide with you forever—the Spirit of truth, whom the world cannot receive, because it neither sees Him nor knows Him; but you know Him, for He dwells with you and will be in you.”
During His last evening with His disciples before His crucifixion, Jesus shared many of the most important truths that would strengthen and help His followers through that terrible time. He gave them the encouragement of knowing that the Father would give them the Holy Spirit to actually dwell in them and always be with them. Though their Friend and Master was going to die, He promised He would come and dwell in them through the Holy Spirit (John 14:18).
The word translated “Helper” in the New King James Version also has other translations, such as Comforter in the King James Version. “The word paracletos signifies not only a comforter, but also an ‘advocate,’ a ‘defender’ of a cause, a ‘counsellor, patron, mediator’” (Adam Clarke’s Commentary, comment on John 14:16).
For more about the gift of the Holy Spirit, see “How Do You Know You Have the Holy Spirit?”