Brevis admonitio Joannis Calvini ad fratres Polonos, ne triplicem in Deo essentiam pro tribus personis imaginando, tres sibi Deos fabricent

I will begin with the first passage, which he shamefully corrupts: "Jehovah your God, God is one." Here, because no comparison is made between the Persons, I say it is wrong to restrict the name of the one God to the Father. For if Jehovah, who has being from himself, is the Father alone, it will follow that the Son is not Jehovah. For how would it be permissible to transfer to the Son what is asserted of the Father alone? Now we must see whether Christ is Jehovah or not. Isaiah saw the God of hosts sitting on the throne. It cannot be denied that he was that same Jehovah whom Moses proclaims to be the one God. But what of John? "When Jesus had done so many signs before them, they did not believe in him, so that the word of Isaiah might be fulfilled." Then, after the passage is cited, "Isaiah said these things when he saw his glory, and spoke about him." It is a futile quibble to object that it was Christ's glory that was shown to the Prophet because he is the image of the Father. For it will not be shaken from us that if Isaiah spoke about Christ, what he says about Jehovah applies to him. Now Paul, so that John 12