Man does not live on bread alone. Bread is necessary, but in order to sustain true life, mankind must live on every word that comes from the mouth of God.
Follow me, and in doing so, you will see the heavens open, and you will see the angels of God ascending and descending on the Son of Man.
My food, is to do the will of him who sent me and to finish his work.
I must preach. That is the reason I have come. I must speak to as many as will hear of why the Father has sent me.