For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren.
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Ambrosiaster
AD 400
Those whom God foreknew would believe in him he chose to receive the promises. But those who appear to believe yet do not persevere in the faith are not chosen by God, because whoever God chooses will persevere. Christ is rightly called the “firstborn” because he was not made before the rest of creation but begotten, and God has chosen to adopt men as his children following Christ’s example. He is the firstborn in the regeneration of the Spirit, in the resurrection from the dead and in the ascension into heaven. Therefore, the firstborn in all things is said to be our brother, because he chose to be born as a man, but he is also Lord, because he is our God. Commentary on Paul’s Epistles.