The Predestination of the Saints/Gift of Perseverance

Moreover, what follows where it is said, “But yet if any of you are not yet called, whom by his grace He has predestinated to be called, you shall receive that grace whereby you shall will to be, and be, elected,” is said more hardly than it could be said if we consider that we are speaking not to men in general, but to the Church of Christ. For why is it not rather said thus: “And if any of you are not yet called, let us pray for them that they may be called. For perchance they are so predestinated as to be granted to our prayers, and to receive that grace whereby they may will, and be made elected”? For God, who fulfilled all that He predestinated, has willed us also to pray for the enemies of the faith, that we might hence understand that He Himself also gives to the unbelievers the gift of faith, and makes willing men out of those that were unwilling.