Lactantius

“ But take care that you never think it probable, as Aristoxenus said, that the mind has no existence, but that the power of perception exists from the constitution of the body and the construction of the organs, as harmony does in the case of the lyre. For musicians call the stretching and sounding of the strings to entire strains, without any striking of notes in agreement with them, harmony. ”

“ Or if the mind has no fixed locality, but runs here and there scattered through the whole body,—which is possible, and was asserted by Xenocrates, the disciple of Plato,—then, inasmuch as intelligence is present in every part of the body, it cannot be understood what that mind is, or what its qualities are, since its nature is so subtle and refined, that, though infused into solid organs by a living and, as it were, ardent perception, it is mingled with all the members. ”

“ For the mind, which exercises control over the body, appears to be placed in the highest part, the head, as God is in heaven; but when it is engaged in any reflection, it appears to pass to the breast, and, as it were, to withdraw to some secret recess, that it may elicit and draw forth counsel, as it were, from a hidden treasury. And therefore, when we are intent upon reflection, and when the mind, being occupied, has withdrawn itself to the inner depth, [1] we are accustomed neither to hear the things which sound about us, nor to see the things which stand in our way. ”

“ That the nature of the mind is also incomprehensible, who can be ignorant, but he who is altogether destitute of mind, since it is not known in what place the mind is situated, or of what nature it is? ”

“ Others have said that its seat is in the brain and, indeed, they have used probable arguments, saying that it was doubtless befitting that that which had the government of the whole body should especially have its abode in the highest place, as though in the citadel of the body; and that nothing should be in a more elevated position than that which governs the whole by reason, just as the Lord Himself, and Ruler of the universe, is in the highest place. ”

“ Then they say, that the organs which are the ministers of each sense, that is, of hearing, and seeing, and smelling, are situated in the head, and that the channels of all these lead not to the breast, but to the brain: otherwise we must be more slow in the exercise of our senses, until the power of sensation by a long course should descend through the neck even to the breast. ”