The Spirit Not Yet Given???

John 7.37 On the last and greatest day of the Feast, Jesus stood and said in a loud voice, “If anyone is thirsty, let him come to me and drink. 38 Whoever believes in me, as the Scripture has said, streams of living water will flow from within him.” 39 By this he meant the Spirit, whom those who believed in him were later to receive. Up to that time the Spirit had not been given, since Jesus had not yet been glorified.

The Spirit of God has been active in the earth at least since Genesis 1.2. Since the time of Adam, people had to enter the Kingdom by being born again of the Spirit just like us. Before the time of Jesus, people were miraculously healed and prophets prophesied. How can John say that “the Spirit had not [yet] been given”? In what possible sense had the Spirit not been given yet?

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