Quod si personae diuisae sunt, substantia uero indiuisa sit, necesse est quod uocabulum ex personis originem capit id ad substantiam non pertinere; at trinitatem personarum diuersitas fecit, trinitas igitur non pertinet ad substantiam. Quo fit ut neque pater neque filius neque spiritus sanctus neque trinitas de deo substantialiter praedicetur, sed ut dictum est ad aliquid. Deus uero ueritas iustitia bonitas omnipotentia substantia inmutabilitas uirtus sapientia et quicquid huiusmodi excogitari potest substantialiter de diuinitate dicuntur. Haec si se recte et ex fide habent, ut me instruas peto; aut si aliqua re forte diuersus es, diligentius intuere quae dicta sunt et fidem si poterit rationemque coniunge. ANICIUS MANLIUS SEVERINUS BOETHIUS MOST HONOURABLE, OF THE ILLUSTRIOUS ORDER OF EX-CONSULS, PATRICIAN TO JOHN THE DEACON WHETHER FATHER, SON, AND HOLY SPIRIT MAY BE SUBSTANTIALLY PREDICATED OF THE DIVINITY The question before us is whether Father, Son, and Holy Spirit may be predicated of the Divinity substantially or otherwise. And I think that the method of our inquiry must be borrowed from what is admittedly the surest source of all truth, namely, the fundamental doctrines of the catholic faith. If, then, I ask whether He who is called Father is a substance, the answer will be yes. If I ask whether the Son is a substance, the reply will be the same. So, too, no one will hesitate to affirm that the Holy Spirit is also a substance. But when, on the other hand, I take together all three, Father, Son, and Holy Spirit, the result is not three substances but one substance. The one substance of the Three, then, cannot be separated or divided, nor is it made up of various parts, combined into one: it is simply one. Everything, therefore, that is affirmed of the divine substance must be common to the Three, and we can recognize what predicates may be affirmed of the substance of the godhead by this sign, that all those which are affirmed of it may also be affirmed severally of each of the Three combined into one. For instance if we say "the Father is God, the Son is God, and the Holy Spirit is God," then Father, Son, and Holy Spirit are one God. If then their one godhead is one substance, the name of God may with right be predicated substantially of the Divinity.