On Faith and the Creed

¹⁶ The divine generation, therefore, of our Lord, and his human dispensation, having both been thus systematically disposed and commended to faith, there is added to our Confession, with a view to the perfecting of the faith which we have regarding God, [the doctrine of] The Holy Spirit, who is not of a nature inferior to the Father and the Son, but, so to say, consubstantial and co-eternal: for this Trinity is one God, not to the effect that the Father is the same [Person] as the Son and the Holy Spirit, but to the effect that the Father is the Father, and the Son is the Son, and the Holy Spirit is the Holy Spirit; and this Trinity is one God, according as it is written, “Hear, O Israel, the Lord your God is one God.” At the same time, if we be interrogated on the subject of each separately, and if the question be put to us, “Is the Father God?” we shall reply, “He is God.” If it be asked whether the Son is God, we shall answer to the same effect. Nor, if this kind of inquiry be addressed to us with respect to the Holy Spirit, ought we to affirm in reply that He is anything else than God; being earnestly on our guard, [however], against an acceptance of this merely in the sense in which it is applied to men, when it is said, “You are gods.” For of all those who have been made and fashioned of the Father, through the Son, by the gift of the Holy Spirit, none are gods according to nature. For it is this same Trinity that is signified when an apostle says, “For of Him, and in Him, and through Him, are all things.” Consequently, although, when we are interrogated on the subject of each [of these Persons] severally, we reply that that particular one regarding whom the question is asked, whether it be the Father, or the Son, or the Holy Spirit, is God, no one, notwithstanding this, should suppose that three Gods are worshipped by us.

17. Neither is it strange that these things are said in reference to an ineffable Nature, when even in those objects which we discern with the bodily eyes, and judge of by the bodily sense, something similar holds good. For take the instance of an interrogation on the subject of a fountain, and consider how we are unable then to affirm that the said fountain is itself the river; and how, when we are asked about the river, we are as little able to call it the fountain; and, again, how we are equally unable to designate the draught, which comes of the fountain or the river, either river or fountain. Nevertheless, in the case of this trinity we use the name water [for the whole]; and when the question is put regarding each of these separately, we reply in each several instance that the thing is water. For if I inquire whether it is water in the fountain, the reply is given that it is water; and if we ask whether it is water in the river, no different response is returned; and in the case of the said draught, no other answer can possibly be made: and yet, for all this, we do not speak of these things as three waters, but as one water. At the same time, of course, care must be taken that no one should conceive of the ineffable substance of that Majesty merely as he might think of this visible and material fountain, or river, or draught. For in the case of these latter that water which is at present in the fountain goes forth into the river, and does not abide in itself; and when it passes from the river or from the fountain into the draught, it does not continue permanently there where it is taken from. Therefore it is possible here that the same water may be in view at one time under the appellation of the fountain and at another under that of the river, and at a third under that of the draught. But in the case of that Trinity, we have affirmed it to be impossible that the Father should be sometime the Son, and sometime the Holy Spirit: just as, in a tree, the root is nothing else than the root, and the trunk (robur) is nothing else than the trunk, and we cannot call the branches anything else than branches; for, what is called the root cannot be called trunk and branches; and the wood which belongs to the root cannot by any sort of transference be now in the root, and again in the trunk, and yet again in the branches, but only in the root; since this rule of designation stands fast, so that the root is wood, and the trunk is wood, and the branches are wood, while nevertheless it is not three woods that are thus spoken of, but only one. Or, if these objects have some sort of dissimilarity, so that on account of their difference in strength they may be spoken of, without any absurdity, as three woods; at least all parties admit the force of the former example—namely, that if three cups be filled out of one fountain, they may certainly be called three cups, but cannot be spoken of as three waters, but only as one all together. Yet, at the same time, when asked concerning the several cups, one by one, we may answer that in each of them by itself there is water; although in this case no such transference takes place as we were speaking of as occurring from the fountain into the river. But these examples in things material (corporalia exempla) have been adduced not in virtue of their likeness to that divine Nature, but in reference to the oneness which subsists even in things visible, so that it may be understood to be quite a possibility for three objects of some sort, not only severally, but also all together, to obtain one single name; and that in this way no one may wonder and think it absurd that we should call the Father God, the Son God, the Holy Spirit God, and that nevertheless we should say that there are not three Gods in that Trinity, but one God and one substance.