John Chrysostom : "Ye have neither heard His voice at any time." How then saith Moses, "The Lord spake, and Moses answered"; and David, "He had heard a tongue which he knew not"; and Moses again, "Is there any such people which hath heard the voice of God?" "Nor seen His shape." Yet Isaiah, Jeremiah, and Ezekiel, are said to have seen Him, and many others. What then is that which Christ saith now? He guideth them by degrees to a philosophical doctrine, showing that with God is neither voice nor shape, but that He is higher than such forms or sounds like these. For as when He saith, "Ye have not heard His voice," He doth not mean that God doth indeed utter a voice, but one which cannot be heard; so when He saith, "Nor seen His shape," He doth not mean that God hath a shape though one invisible, but that neither of these things belongeth to God. And in order that they might not say, "Thou art a boaster, God spake to Moses only"; (this at least they did say, "We know that God spake with Moses: as for this fellow, we know not whence He is";) on this account He spake as He did, to show that there is neither voice nor shape with God. — HOMILIES ON THE GOSPEL OF John 40