Do not work for the food that perishes, but for the food that endures for eternal life, which the Son of Man will give you. For it is on him that God the Father has set his seal.” Then they said to him, “What must we do to perform the works of God?” Jesus answered them, “This is the work of God, that you believe in him whom he has sent.” So they said to him, “What sign are you going to give us then, so that we may see it and believe you? What work are you performing? Our ancestors ate the...