"Jesus answered him, 'Where I am going you cannot follow Me now, but you shall follow Me afterward."
"And when had spoken this, He said to him, 'Follow Me' " (John 21: 19). Three years earlier Jesus had said, "Follow Me" (Matthew 4:19), and Peter followed with no hesitation. Then irresistible attraction of Jesus was upon him and he did not need the Holy Spirit to help him do it. later he came to the place where he denied Jesus, and his heart broke. Then he received the Holy Spirit and Jesus said again, "Follow Me" (John 21:19). Now no one is in front of Peter except the Lord Jesus Christ. The first "Follow Me" was nothing mysterious; it was and external following. Jesus is now asking for an internal sacrifice and yielding (see 21:18).
Between these two times Peter denied Jesus with oaths and curses (see Matthew 26:69-75). But then he came completely to the end of himself he would ever rely on again. In his state of destitution, he was finally ready to receive all that the risen Lord had for him. "...he breathed on them, and said to them, 'Receive the Holy Spirit' " (John 20:22). No matter what changes God has performed in you, never rely on them. Build only on a Person, the Lord Jesus Christ, and on the Spirit He gives.
All our promises and resolutions end in denial because we have no power to accomplish them. When we come to the end of ourselves, not just mentally but completely, we are able to "receive the Holy Spirit." "receive the Holy Spirit"---the idea is that of invasion. There is now only One who directs the course of your life, the Lord Christ.