Orthodox Apologetics

Diodore of Tarsus (circa 390)
This text [Romans 8:29-30] does not take away our free will. It uses the word foreknew before predestined. Now it is clear that foreknowledge does not by itself impose any particular behavior. What is said here would be clearer if we started from the end and worked backwards. Whom did God glorify? Those whom he justified. Whom did he predestine? Those whom he foreknew, who were called according to his plan, i.e., who demonstrated that they were worthy to be called by his plan and made conformable to Christ. (Romans (Ancient Christian Commentary on Scripture. New Testament, volume 6. Edited by Thomas Oden. P 235)


Ambrosiaster (late 4th century)
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 whosever God chooses will persevere. (Ancient Christian Commentary on Scripture. New Testament, volume 6. Edited by Thomas Oden. P 235)


Theodoret of Cyrus (circa 393 – 457)
Those whose intentions God foreknew he predestined from the beginning. Those who are predestined, he called, and those who were called, he justified by baptism. Those who were justified, he glorified, calling them children. To all who received him, who believed in his name, he gave power to become the children of God. Let no one say that God’s foreknowledge was the unilateral cause of these things. For it was not foreknowledge which justified people, but God knew what would happen to them, because he is God. (Ancient Christian Commentary on Scripture. New Testament, volume 6. Edited by Thomas Oden. P 237)