Origen

“ But even if it were once granted that such a course was not only possible, but could be accomplished with propriety (by God) , why would not one rather inquire (asking a question like that of Celsus) why it was not possible for God, by means of His divine power, to create men who needed no improvement, but who were of themselves virtuous and perfect, evil being altogether non-existent? These questions may perplex ignorant and foolish individuals, but not him who sees into the nature of things; for if you take away the spontaneity of virtue, you destroy its essence. ”

“ And he continues: “What is the meaning of such a descent upon the part of God?” not observing that, according to our teaching, the meaning of the descent is pre-eminently to convert what are called in the Gospel the lost “sheep of the house of Israel;” and secondly, to take away from them, on account of their disobedience, what is called the “kingdom of God,” and to give to other husbandmen than the ancient Jews, viz. to the Christians, who will render to God the fruits of His kingdom in due season (each action being a “fruit of the kingdom”) . ”