People often wonder why Catholics have to go to a priest to be forgiven their sins. Some point out that St. Paul tells us that Jesus is the only Mediator between God and man (1 Tm 2:5).
But while Jesus is the only way to the Father and the only Mediator, Scripture makes it very clear that God calls other human beings to participate in this mediation. From the very beginning of God's revelation to Israel 3,700 years ago, God has chosen individual human beings — people like Abraham, Moses and the prophets — to communicate, or mediate, His will to the world. And in today's Gospel text, St. Mark reminds us that God sent St. John the Baptist to act as a mediator between Jesus and the Jews.