In today's Gospel reading from Matthew 16, Jesus asked his disciples, "Who do people say that the Son of Man is? They replied, 'Some say John the Baptist, others Elijah, still others Jeremiah or one of the prophets." He said to them, "But who do you say that I am?" Simon Peter said in reply, "You are the Son of the living God." Jesus said to him in reply, "Blessed are you, Simon son of Jonah. For flesh and blood has not revealed this to you, but my heavenly Father." It is the key to entering the kingdom of heaven to be able to believe and say truly that Jesus is the Son of the living God.