You do the deeds of your father.
Then said they to him, We are not born of fornication; we have one Father, even God.
All Commentaries on John 8:41 Go To John 8
Cyril of Alexandria
AD 444
YE do the deeds of your father.
Having shewn that the Jews are utterly of other manner than their ancestor, and far removed from his piety, He with good reason strips them of their empty fleshly boast. And saying openly that they ought not any longer to be enrolled among his children, He allots them to another father like unto them, and affixed similitude of deeds as a sort of bond of kindred, teaching that the good ought to be joined to the good, and deciding that it is meet that they who live ill should have as fathers those who have been condemned for the like. For like as they who have chosen to live excellently, and are therefore even now called saints, may without hazard call God their Father, so to the wicked is the wicked one rightly ascribed as father, seeing that they form the image of his wickedness and perversity in their characters. For not altogether is he who begot of himself conceived of as father by the Divine Scripture, but he too who has any conformed to his own character, of whom he is said to be therefore father. Thus does the Divine Paul too write to certain, for in Christ Jesus through the Gospel did I beget you. As then (as we said) some are conformed both to God and to the holy fathers through likeness in manners and holiness; so to the devil too and to those like in conduct to him are some rendered like-minded, suffering this through their own depravity. Therefore to the saints the saints are fathers, but to the wicked the wicked who betake themselves to them, most befittingly. And the one, who in holiness take the impression (so to say) of the Divine Form on their own souls, and have the confidence that befits own sons, will with reason say Our Father which art in heaven: the bad again will be ascribed to their own father, begotten as it were through likeness unto him unto equal depravity with him. To the Jews therefore Christ allots and names another father than the holy Abraham, and who, He does not as yet clearly say.