John 16:5-16, (Jesus speaking) "Now I Am going to Him Who sent Me, yet none of you asks Me, 'Where are You going?' Because I say these things you are filled with grief. But, I tell you the truth: It is for your good I Am going away. Unless I go away, the Holy Spirit will not come to you. If I go I will send Him to you. When He comes He will convict the world of guilt in regard to sin, righteousness and judgment in regard to sin. Because I Am going to the Father, where you can see Me no longer, and regard to judgment because the prince of this world (Satan, the devil) now stands condemned. When the Spirit of Truth comes He will guide you into all truth...He will tell you what is yet to come. He will bring glory to Me by taking from what is Mine and making it known to you. In a little while you will not see Me anymore, and then after a little while you will see Me."
Christ had to leave after His resurrection in order for His Holy Spirit to come and enter each believer and follower of Him. This first occurred at Pentecost (Acts 2:2-4) "Suddenly a sound like a violent wind came from heaven and filled the whole house where they were sitting. They saw what seemed to be tongues of fire that separated and came to rest on each of them. All of them were filled with the Holy Spirit..." Since then each new believer who accepts Jesus Christ as Savior and LORD, the Holy Spirit enters. Ephesians 1:13-14, "Having believed you were marked in Him (Jesus) with a seal, the promise of the Holy Spirit Who is a deposit guaranteeing...redemption of those who are GOD's possession - to the praise of His glory." Follow His Holy Spirit's leading, guiding, and direction of your life with your thoughts, words, and deeds to be to His glory, honor, and praise! And, watch His promises to you be fulfilled even into Eternity with Him forever and ever! Amen!