John the Baptist, when he saw Jesus, testified that He was the Lamb of God who came to take away the sin of the world. He mentions that Jesus is the One whom he had spoken of before. He knew Him not but that He should be revealed to Israel and that he, John, comes baptizing with water. His baptisms are his way of preparing Israel for the Messiah who will baptize with the Holy Spirit.
Luke’s Gospel elaborates on John’s role. He was to come before Jesus in the manner of an earlier prophet–Elijah, to turn the hearts of the fathers to the children and the disobedient to wisdom of the just; to make people ready–to prepare them for the Lord.
John the Baptist was called the prophet of the Highest because he was to go before Jesus to prepare His way. He was to let the people know about salvation by the remission of their sins. John went about saying, “Repent you: for the kingdom of Heaven is at hand.” He was fulfilling the prophecy of Isaiah. God revealed Jesus to John, for John testified that he had seen the Spirit descending from Heaven like a dove and settle on Him. God had told John that the person he saw the Spirit descend and remain on was the One who would baptize with the Holy Spirit. John witnessed this phenomenon and testified that Jesus was the Son of God.
Like John the Baptist, Jesus is revealed to us and it is up to us to share this revelation with others. We can declare to others that Jesus is the Son of God and through Him we receive the Holy Spirit. After Jesus came, baptism was done in the name of the Father, the Son and the Holy Spirit. As in Jesus’ case, we too receive the Holy Spirit in baptism.