3. _It is also charged against the doctrine of the Trinity, __“__that it is a contradiction in terms, and therefore essentially incredible.__”_ To this it is replied, that it would be a contradiction if God were called Three _in the same sense_ in which he is called One; but not otherwise. The answer is perfectly satisfactory; and we therefore proceed to ask, In what sense is he called Three, and in what sense is he called One? The answer is, The Unity is of essence, or substance: the Trinity is of persons. This answer, again, is satisfactory, provided we know what is meant by these two terms. But the difficulty is to know what is meant by the word “person.” We are expressly informed, that this term is not used in its usual sense; for, if it were, it would divide the essence, and three Persons would be the same as three Gods. On the other hand, we are told that it means more than the three characters or manifestations. Here lies the difficulty, and the whole of the rational difficulty, in the doctrine of the Trinity. It is all on the side of the Triad. When we ask, What do you mean by “the three”? there can be given but three answers,—two of them distinct, and one indistinct. These answers are, (1.) We mean three somethings, which we cannot define; (2.) We mean three Persons, like Peter, James, and John; (3.) We mean three manifestations, characters, or modes of being. Let us consider these three answers. (_a._) “The three Persons are three somethings, which cannot be defined. It is a mystery. It is above reason. There is mystery in everything, and there must be mystery in the Deity.” So Augustine said, long ago, “We say three Persons, not because we have anything to say, but because we want to say something.”(85) But if one uses the phrase “three Persons,” and refuses to define it positively, merely defining it negatively, saying, “It does not mean this, and it does not mean that, and I don’t know what it does mean,” he avoids, it is true, the difficulties, and escapes the objections; but he does it by giving up the article of faith. No one can deny that there _may be_ three unknown distinctions in the divine nature; but no one can be asked to believe in them, till he is told what they are. To say, therefore, that the Trinity is a mystery, is to abandon it as an article of faith, and make of it only a subject of speculation. We avoid the contradiction; but we do it by relinquishing the doctrine.