22 I am aware that the full explanation of these words involves the discussion of many and weighty problems. I do not shirk them, but postpone them for the present, reserving their consideration for later stages of the enquiry. For the present I devote myself to that article of the blasphemers' faith, or rather faithlessness, which asserts that Moses proclaims the solitude of God. We do not forget that the assertion is true in the sense that there is One God, from Whom are all things; but neither do we forget that this truth is no excuse for denying the Godhead of the Son, since Moses throughout the course of his writings clearly indicates the existence of God and God. We must examine how the history of God's choice, and of the giving of the Law, proclaims God co-ordinate with God.
Source: On the Trinity (New Advent)