When John the Baptist saw the sky crack open and the Holy Spirit descend on Jesus like a dove all he could utter was, "Behold, the Lamb of God that takes away the sin of the world." And then John sent two of his disciples to follow Jesus.
Did you ever wonder why John didn't also follow his Lord? Did you wonder why he continued to baptize after he revealed Jesus to the world? And did you ever wonder why his message changed from, "Repent for the kingdom of heaven is at hand!" to "Herod, it is not lawful for you to take your brother's wife as your own."
How is that preparing the way for the coming of the Lord?