He says this, to make his preaching credible, which it must be if it rests on Moses and the Prophets besides, and by this to abash his hearer. For since Nathanael was an exact man, and one who viewed all things with truth, as Christ also testified and the event showed, Philip with reason refers him to Moses and the Prophets, that so he might receive Him who was preached. And he not troubled though he called Him “the son of Joseph”; for still he was supposed to be his son. “And whence, O Philip, is it plain that this is He? What proof dost thou mention to us? for it is not enough merely to assert this. What sign hast thou seen, what miracle? Not without danger is it to believe without cause in such matters. What proof then hast thou?” “The same as Andrew,” he replies; for he though unable to produce the wealth which he had found, or to describe his treasure in words, when he had discovered it, led his brother to it. So too did Philip. How this is the Christ, and how the prophets proclaimed Him beforehand, he said not; but he draws him to Jesus, as knowing that he would not afterwards fall off, if he should once taste His words and teaching.