Jesus is telling the disciples and us that He must leave but He will return one day. If Jesus doesn’t go to the Father, then the Holy Spirit will not come to abide with us. Jesus knew and understood that the time was swiftly approaching when He would not be able to see and talk to all the people that needed to hear the Good News. But the Father already had a plan in place, His Spirit would come and abide in each of us, so that none of us would ever be alone again. The Holy Spirit will teach us, lead us and prepare us for the return of our soon coming King. Jesus is also telling the disciples and us that satan is not defeating Him, but still, He must do what He must do. It has been the plan since eternity that He would be the perfect, sacrificial Lamb that would redeem fallen man. The time was quickly approaching for Jesus to complete His mission here on earth. He needed to return to the Father because He had work to do in heaven.
24 But because Jesus lives forever, his priesthood lasts forever. 25 Therefore he is able, once and forever, to save those who come to God through him. He lives forever to intercede with God on their behalf.—Hebrews 7:24, 25 (NLT)
“The Gospel has come to you because it’s on its way to someone else.” -Anonymous