Today's Gospel acclamation, Matthew 4:4b, was quoted by Jesus from Moses' second long address of Deuteronomy: "One does not live by bread alone, but by every word that comes forth from the mouth of God." We eat bread in order to sustain ourselves physically. To sustain our spiritual life, we need be fed by every word that comes from God. The spiritual life is so much more important than the physical one. What good is it to have a healthy body but a sick soul? It is a clean, healthy soul that will enable you to live forever.