"This food the son of Adam will give you, for he it is upon whom the Father has set the seal of his authority."
"Then what must we do," they asked him, "if we are to be doing the works of God?"
Jesus replied, "This is the work that God requires: believe in the one whom He has sent."
So they said to him, "Then what sign do you do, that we may see, and believe you? What work do you perform?"