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

the admirable counsel of God, which was not badly expressed by the name of Dispensation, should suffice for us. The statement of Christ, “The Father is greater than I,” was restricted to his human nature; but I do not hesitate to extend it to the whole complex, because although he is the eternal God, yet when he descended to us, he began to be a mediator between God and us. For this reason, the Father is called the one God, because Christ, surrounded by flesh, presides over the Church in such a way that he has God as his head, as Paul teaches. In this way also, God governs us mediately through the hand of his Son, until we are led to the solid conjunction of glory, in which the Son will be subjected to the Father, so that God may be all in all. According to this Dispensation, Christ himself prayed on earth, and now, relying on him as our advocate, we pray to the Father in his name. There is nothing forced or thorny in this doctrine, because Christ does not come to us except as a Mediator, who went forth from God; yet he has God remaining in him, and all the fullness of the deity resides in him, so that he may finally lead us to God
1 Cor. 14