19. The heretics when beset by authoritative passages in Scripture are wont only to grant that the Son is like the Father in might while they deprive Him of similarity of nature. This is foolish and impious, for they do not understand that similar might can only be the result of a similar nature. For a lower nature can never attain to the might of a higher and more powerful nature. What will the men who make these assertions say about the omnipotence of God the Father, if the might of a lower nature is made equal to His own? For they cannot deny that the Son’s power is the same, seeing that He has said What things soever the Father doeth, these also doeth the Son likewise.
No, a similarity of nature follows on a similarity of might when He says, As the Father hath life in Himself, so also hath He given to the Son to have life in Himself. In life is implied nature and essence; this, Christ teaches, has been given Him to have as the Father hath. Therefore similarity of life contains similarity of might: for there cannot be similarity of life where the nature is dissimilar. So it is necessary that similarity of essence follows on similarity of might: for as what the Father does, the Son does also, so the life that the Father has He has given to the Son to have likewise. Therefore we condemn the rash and impious statements of those who confess a similarity of might but have dared to preach a dissimilarity of nature, since it is the chief ground of our hope to confess that in the Father and the Son there is an identical divine substance.
VII. “And if any one professing that he believes that there is a Father and a Son, says that the Father is Father of an essence unlike Himself but of similar activity; for speaking profane and novel words against the essence of the Son and nullifying His true divine Sonship, let him be anathema.”
19. Virtutis similitudo non est nisi ex naturae similitudine. Vita essentia significatur.---Conclusi haeretici Scripturarum auctoritatibus, hoc solum tribuere solent Filio, ut Patri tantum virtute similis sit, adimunt autem ei similitudinem naturae: stulti atque impii, non intelligentes non nisi ex naturae similitudine similitudinem esse virtutis. Neque enim aliquando inferior natura, superioris a se potiorisque naturae virtutem consequitur. Aut quid haec asserentes de omnipotente Deo patre profitebuntur, si virtuti suae virtus naturae inferioris aequatur? Non enim potest negari, quin Filius idem possit; cum dixerit: Quaecumque facit 472 Pater, eadem et Filius facit similiter (Joan. V, 19). Sed similitudini 0495C virtutis naturae similitudo succedit, cum dicit: Sicut habet Pater vitam in se, ita et Filio dedit vitam habere in semetipso (Ibid., 26). In vita, naturae et essentiae significatio est: quae sicut habetur, ita data esse docetur ad habendum. Tenet ergo vitae similitudo virtutis similitudinem: similitudo enim virtutis non potest esse dissimilis naturae. Atque ita necesse est, ut essentiae similitudo virtutis similitudinem consequatur: quia sicut ea quae Pater facit, eadem et Filius facit: ita sicut habens vitam Pater, sic habendam Filio dedit vitam. Condemnatur ergo impiae professionis temeritas, quae virtutis similitudinem confitens, dissimilitudinem ausa sit praedicare naturae: cum principalis spei nostrae fides sit, indifferentem in Patre et Filio divinitatis substantiam confiteri.
0496A VII.«Et si quis Patrem et Filium credere se promittens, Patrem dissimilis sibi essentiae patrem dicat, sed similis efficaciae; quasi profanas et novas voces contra essentiam Filii loquens, et interimens vere Dei filium esse: anathema sit.»