9. What therefore remains, except that we confess that these terms sprang from the necessity of speaking, when copious reasoning was required against the devices or errors of the heretics? For when human weakness endeavored to utter in speech to the senses of man what it grasps in the secret places of the mind in proportion to its comprehension respecting the Lord God its creator, whether by devout faith, or by any discernment whatsoever; it feared to say three essences, lest any difference should be understood to exist in that absolute equality. Again, it could not say that there were not three somewhats (tria quædam), for it was because Sabellius said this that he fell into heresy. For it must be devoutly believed, as most certainly known from the Scriptures, and must be grasped by the mental eye with undoubting perception, that there is both Father, and Son, and Holy Spirit; and that the Son is not the same with the Father, nor the Holy Spirit the same with the Father or the Son. It sought then what three it should call them, and answered substances or persons; by which names it did not intend diversity to be meant, but singleness to be denied: that not only unity might be understood therein from the being called one essence, but also Trinity from the being called three substances or persons. For if it is the same thing with God to be (esse) as to subsist (subsistere), they were not to be called three substances, in such sense as they are not called three essences; just as, because it is the same thing with God to be as to be wise, as we do not say three essences, so neither three wisdoms. For so, because it is the same thing to Him to be God as to be, it is not right to say three essences, as it is not right to say three Gods. But if it is one thing to God to be, another to subsist, as it is one thing to God to be, another to be the Father or the Lord (for that which He is, is spoken in respect to Himself, but He is called Father in relation to the Son, and Lord in relation to the creature which serves Him); therefore He subsists relatively, as He begets relatively, and bears rule relatively: so then substance will be no longer substance, because it will be relative. For as from being, He is called essence, so from subsisting, we speak of substance. But it is absurd that substance should be spoken relatively, for everything subsists in respect to itself; how much more God?