Institutio vera de praecipuis fidei articulis

and the flesh of Christ posterior to the Son of God, Iehouah Jehovah, El, Shaddai Almighty, or God of hosts. Because the Word of God is the beginning and the end, that is, Iehouah Jehovah the Creator of all, and the preserver of all. Isaiah 43, 44, 45: I am Iehouah Jehovah, Creator, preserver, I swear by myself, because every knee shall bend to me. Romans 14.

TWENTY-FIFTH INSTITUTION.
Just as in nature an argument from disparate things does not proceed—for example: Adam's body is mortal, corruptible, from the earth; therefore, Adam's soul is also corruptible, made from the slime of the earth, not inspired from the mouth of God—so this reasoning is foolish: Christ the man began to be a man and to be called God at the end of the age; therefore, the Word of God also began to be and to be called the Son of God. For the Word of God was with God from the beginning, before the creation, and all things were made through him. This Word of God, coming into the world, was made flesh, that is, he assumed the form of a servant, the seed of Abraham, at the end of the age.

TWENTY-SIXTH INSTITUTION.
Just as the whole human race, or the whole extreme needing reconciliation to God, could not be born of Mary and be the Son of David and mediator unless that promised seed of Abraham had been conceived of the Holy Spirit and born of the virgin Mary: so the whole Trinity, one sole Deity and fullness of the Deity, could not be born of the Father and be the only-begotten Son; so it could not be the mediator as whole God, that is, the three witnesses simultaneously, unless the Word of God, the power and wisdom born from the mouth of the Most High, that Angel of the Covenant, appeared to the fathers and led out the Jews.