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

I believe I have already achieved that in my refutation of Gentilis.
Now I come to the second head of this question. Christ everywhere distinguishes himself from the Father, I admit: namely, insofar as he sustains the person of a Mediator. For I have rightly admonished in some places, and indeed more often inculcated, that what Christ predicts of himself in the Gospel of John does not belong to his human or divine nature separately, but refers to the office enjoined upon him by the Father. Therefore, where he makes himself one with the Father, his purpose was far different than to raise us to a naked speculation of his secret essence; rather, he reasons from the end, that we will be one with the Father because the Father resides in him. Therefore, it will not be tedious to relate what I wrote some time ago: “In order to understand correctly how Christ and the Father are one, beware of stripping him of the person of Mediator, but rather consider him as the head of the Church, and join him to his members; thus the context will stand best, lest the unity of the Son with the Father be rendered empty or useless, since its virtue must be diffused throughout the whole body of the pious.” Again, where the Son is subjected to the Father as if inferior, it does not pertain to discuss too curiously how this fits God manifested in the flesh, because