We are now able to determine what a dogma of faith is, and what it is to believe it. A dogma is a proposition; it stands for a notion or for a thing; and to believe it is to give the assent of the mind to it, as it stands for the one or for the other. To give a real assent to it is an act of religion; to give a notional, is a theological act. It is discerned, rested in, and appropriated as a reality, by the religious imagination; it is held as a truth, by the theological intellect. Not as if there were in fact, or could be, any line of demarcation or party-wall between these two modes of assent, the religious and the theological. As intellect is common to all men as well as imagination, every religious man is to a certain extent a theologian, and no theology can start or thrive without the initiative and abiding presence of religion. As in matters of this world, sense, sensation, instinct, intuition, supply us with facts, and the intellect uses them; so, as regards our relations with the Supreme Being, we get our facts from the witness, first of nature, then of revelation, and our doctrines, in which they issue, through the exercise of abstraction and inference. This is obvious; but it does not interfere with holding that there is a theological habit of mind, and a religious, each distinct from each, religion using theology, and theology using religion. This being understood, I propose to consider the dogmas of the Being of a God, and of the Divine Trinity in Unity, in their relation to assent, both notional and real, and principally to real assent;—however, I have not yet finished all I have to say by way of introduction. Now first, my subject is assent, and not inference. I am not proposing to set forth the arguments which issue in the belief of these doctrines, but to investigate what it is to believe in them, what the mind does, what it contemplates, when it makes an act of faith. It is true that the same elementary facts which create an object for an assent, also furnish matter for an inference: and in showing what we believe, I shall unavoidably be in a measure showing why we believe; but this is the very reason that makes it necessary for me at the outset to insist on the real distinction between these two concurring and coincident courses of thought, and to premise by way of caution, lest I should be misunderstood, that I am not considering the question that there is a God, but rather what God is.