XXV. (127) And this logeum is described as double with great correctness; for reason is double, both in the universe and also in the nature of mankind, in the universe there is that reason which is conversant about incorporeal species which are like patterns as it were, from which that world which is perceptible only by the intellect was made, and also that which is concerned with the visible objects of sight, which are copies and imitations of those species above mentioned, of which the world which is perceptible by the outward senses was made. Again, in man there is one reason which is kept back, and another which finds vent in utterance: and the one is, as it were a spring, and the other (that which is uttered) flows from it; and the place of the one is the dominant part, that is, the mind; but the place of the one which finds vent in utterance is the tongue, and the mouth, and all the rest of the organs of the voice. (128) And the architect assigned a quadrangular form to the logeum, intimating under an exceedingly beautiful figure, that both the reason of nature, and also that of man, ought to penetrate everywhere, and ought never to waver in any case; in reference to which, it is that he has also assigned to it the two virtues that have been already enumerated, manifestation and truth; for the reason of nature is true, and calculated to make manifest, and to explain everything; and the reason of the wise man, imitating that other reason, ought naturally, and appropriately to be completely sincere, honouring truth, and not obscuring anything through envy, the knowledge of which can benefit those to whom it would be explained; (129) not but what he has also assigned their two appropriate virtues to those two kinds of reason which exist in each of us, namely, that which is uttered and that which is kept concealed, attributing clearness of manifestation to the uttered one, and truth to that which is concealed in the mind; for it is suitable to the mind that it should admit of no error or falsehood, and to explanation that it should not hinder anything that can conduce to the most accurate manifestation. (130) Therefore there is no advantage in reason which expends itself in dignified and pompous language, about things which are good and desirable, unless it is followed by consistent practice of suitable actions; on which account the architect has affixed the logeum to the robe which is worn over the shoulder, in order that it may never get loose, as he does not approve of the language being separated from the actions; for he puts forth the shoulder as the emblem of energy and action.