They came to John, and said to him, "Rabbi, he who was with you beyond the Jordan, to whom you have testified, behold, the same baptizes, and everyone is coming to him."
The word must, again, is one of those words you've got to pay careful attention to, because there, you're coming to the heart of the issue when a person says, "I must." When God said, "You must," it is something you need to pay careful heed to, and He said, "You must be born again." There is no one who will enter the kingdom of heaven who is not born again. He's talking about if you want to come into the kingdom of heaven, you must be born again. You cannot come into the kingdom apart from being born again. God's divine imperative for any man who will come into the kingdom is that spiritual birth, you must be born the second time, born of the Spirit of God.