Book V.
Proceeds to treat of the arguments put forward by the heretics, not from Scripture, but from their own reason. Those are refuted, who think the substance of the Father and of the Son to be not the same, because everything predicated of God is, in their opinion, predicated of Him according to substance; and therefore it follows, that to beget and to be begotten, or to be begotten and unbegotten, being diverse, are diverse substances; whereas it is here demonstrated that not everything predicated of God is predicated according to substance, in such manner as He is called good and great according to substance, or anything else that is predicated of Him in respect to Himself; but that some things are also predicated of Him relatively, i.e. not in respect to Himself, but to something not Himself, as He is called Father in respect to the Son, and Lord in respect to the creature that serveth Him; in which case, if anything thus predicated relatively, i.e. in respect to something not Himself, is even predicated as happening in time, as e.g. “Lord, thou hast become our refuge,” yet nothing happens to God so as to work a change in Him, but He Himself remains absolutely unchangeable in His own nature or essence.
LIBER QUINTUS. Venit ad haereticorum argumenta illa quae non ex divinis Libris, sed ex rationibus suis proferunt: et eos refellit, quibus ideo videtur non eamdem Patris ac Filii esse substantiam, quia omne quod de Deo dicitur, secundum substantiam dici putant; et propterea et gignere et gigni, vel genitum esse et ingenitum, quoniam diversa sunt, contendunt substantias esse diversas; demonstrans, non omne quod de Deo dicitur secundum substantiam dici, sicut secundum substantiam dicitur bonus et magnus, et si quid aliud ad se dicitur; sed dici etiam relative, id est non ad se, sed ad aliquid quod ipse non est, sicut Pater ad Filium dicitur, vel Dominus ad creaturam sibi servientem: ubi si quid relative, id est ad aliquid quod ipse non est, etiam ex tempore dicitur, sicuti est, Domine, refugium factus es nobis; nihil ei accidere quo mutetur, sed omnino ipsum in natura vel essentia sua immutabilem permanere.
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