John Chrysostom
Catena Aurea · Johannesevangelium 1
He came unto his own, and his own received him not. But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
(Hom. x. [ix.] 2) He saith not that He made them the sons of God, but gave them power to become the sons of God: shewing that there is need of much care, to preserve the image, which is formed by our adoption in Baptism, untarnished: and shewing at the same time also that no one can take this power from us, except we rob ourselves of it. Now, if the delegates of worldly governments have often nearly as much power as those governments themselves, much more is this the case with us, who derive our dignity from God. But at the same time the Evangelist wishes to shew that this grace comes to us of our own will and endeavour: that, in short, the operation of grace being supposed, it is in the power of our free will to make us the sons of God.