On Faith and the Creed

²⁰ Those parties oppose this opinion who think that the said communion, which we call either Godhead, or Love, or Charity, is not a substance. Moreover, they require the Holy Spirit to be set forth to them according to substance; neither do they take it to have been otherwise impossible for the expression “God is Love” to have been used, unless love were a substance. In this, indeed, they are influenced by the wont of things of a bodily nature. For if two bodies are connected with each other in such wise as to be placed in juxtaposition one with the other, the connection itself is not a body: inasmuch as when these bodies which had been connected are separated, no such connection certainly is found [any more]; while, at the same time, it is not understood to have departed, as it were, and migrated, as is the case with those bodies themselves. But men like these should make their heart pure, so far as they can, in order that they may have power to see that in the substance of God there is not anything of such a nature as would imply that therein substance is one thing, and that which is accident to substance (aliud quod accidat subsantiœ) another thing, and not substance; whereas whatsoever can be taken to be therein is substance. These things, however, can easily be spoken and believed; but seen, so as to reveal how they are in themselves, they absolutely cannot be, except by the pure heart. For which reason, whether the opinion in question be true, or something else be the case, the faith ought to be maintained unshaken, so that we should call the Father God, the Son God, the Holy Spirit God, and yet not affirm three Gods, but hold the said Trinity to be one God; and again, not affirm these [Persons] to be different in nature, but hold them to be of the same substance; and further uphold it, not as if the Father were sometime the Son, and sometime the Holy Spirit, but in such wise that the Father is always the Father, and the Son always the Son, and the Holy Spirit always the Holy Spirit. Neither should we make any affirmation on the subject of things unseen rashly, as if we had knowledge, but [only modestly] as believing. For these things cannot be seen except by the heart made pure; and [even] he who in this life sees them “in part,” as it has been said, and “in an enigma,” cannot secure it that the person to whom he speaks shall also see them, if he is hampered by impurities of heart. “Blessed,” however, “are they of a pure heart, for they shall see God.” This is the faith on the subject of God our Maker and Renewer.

21. But inasmuch as love is enjoined upon us, not only toward God, when it was said, “You shall love the Lord your God with all your heart, and with all your soul, and with all your mind;” but also toward our neighbor, for “you shall love,” says He, “your neighbor as yourself;” and inasmuch, moreover, as the faith in question is less fruitful, if it does not comprehend a congregation and society of men, wherein brotherly charity may operate—