There seems to be some question as to what predestination is. This quote from “The Mystical City of God” might add some clarity.
The predestined were chosen by free grace, and the foreknown were reprobated with exact justice. All that was convenient and necessary for the conservation of the human race and for obtaining the end of the Redemption and the Predestination, was preordained, without interfering with the free will of men; for such ordainment was more conformable to God’s nature and to divine equity. There was no injustice done to them, for if with their free will they could sin, so also could they abstain from sin by means of grace and the light of reason. God violated the right of no one, since He forsook no one nor denied to any one that which is necessary. Since his law is written in the hearts of men, nobody is excused for not knowing and loving Him as the highest Good of all creation.
Mary of Agreda. Mystical City of God: Full Edition (Kindle Locations 1505-1510). Stella Maris Media. Kindle Edition.