Let this then be enough to say concisely about the essence of the soul. And now proceeding in regular order, we will explain the expression, that "the voice of his blood cries out," in this manner, —of our soul, one part is dumb, and one part is endowed with utterance. All that part which is devoid of reason is likewise destitute of voice, but all that part which is rational is capable of speech, and that part alone has formed any conception of God; for, by the other parts of us, we are not able to comprehend God, or any other object of the intellect.
Of our vivifying power, therefore, of which the blood is, as it were, the essence, one portion has particular honour, namely, that of speech and reason; I do not mean the stream which flows through the mouth and tongue, but I speak of the fountain itself, from which the channels of utterance are, in the course of nature, filled. And this fountain is the mind; by means of which, all our conversations with and cries to the living God take place, at one time being voluntary, and at another involuntary.