The greatest mystery of our Faith is the Incarnation, the almost unbelievable occurrence of God, the creator and sustainer of the universe, switching to become one of his billions of subjects. For us to say it just could not happen, would be for us to limit what God can bring about.
We ask why would God the almighty so lower himself. In Chapter Two of his Letter to the people of Philippi Paul said God did it in an effort at showing us how important humility is to him. He wrote:
"Let this mind be in you that was also in Christ Jesus: who although he was in the form of God, did not consider equality with God something to be clung to. Rather, he emptied himself, taking the form of a slave, coming in human likeness."
In today's Gospel the Jews asked why should they believe that Jesus came from God, bearing God's endorsement?
Jesus replied that he was performing acts that had to be seen as an endorsement of his messages from God.