34 Let this be taken as our answer from the books of Moses, or rather as the answer of Moses himself. The heretics imagine that they can use his assertion of the Unity of God in disproof of the Divinity of God the Son; a blasphemy in defiance of the clear warning of their own witness, for whenever he confesses that God is One he never fails to teach the Son's Divinity. Our next step must be to adduce the manifold utterance of the prophets concerning the same Son.
Source: On the Trinity (New Advent)