Why then did he say not that “He made them sons of God,” but that “He gave them power to become sons of God”? To show that we need much zeal to keep the image of sonship impressed on us at Baptism, all through without spot or soil ; and at the same time to show that no one shall be able to take this power from us, unless we are the first to deprive ourselves of it. For if among men, those who have received the absolute control of any matters have well-nigh as much power as those who gave them the charge; much more shall we, who have obtained such honor from God, be, if we do noth ing unworthy of this power, stronger than all; because He who put this honor in our hands is greater and better than all. At the same time too he wishes to show, that not even does grace come upon man irrespectively, but upon those who desire and take pains for it. For it lies in the power of these to become (His) children since if they do not themselves first make the choice, the gift does not come upon them, nor have any effect.