On the Making of Man

¹ Now the exact structure of our body each man teaches himself by his experiences of sight and light and perception, having his own nature to instruct him; any one too may learn everything accurately who takes up the researches which those skilled in such matters have worked out in books. And of these writers some learned by dissection the position of our individual organs; others also considered and expounded the reason for the existence of all the parts of the body; so that the knowledge of the human frame which hence results is sufficient for students. But if any one further seeks that the Church should be his teacher on all these points, so that he may not need for anything the voice of those without (for this is the wont of the spiritual sheep, as the Lord says, that they hear not a strange voice), we shall briefly take in hand the account of these matters also.

2. We note concerning our bodily nature three things, for the sake of which our particular parts were formed. Life is the cause of some, good life of others, others again are adapted with a view to the succession of descendants. All things in us which are of such a kind that without them it is not possible that human life should exist, we consider as being in three parts; in the brain, the heart, and the liver. Again, all that are a sort of additional blessings, nature's liberality, whereby she bestows on man the gift of living well, are the organs of sense; for such things do not constitute our life, since even where some of them are wanting man is often none the less in a condition of life; but without these forms of activity it is impossible to enjoy participation in the pleasures of life. The third aim regards the future, and the succession of life. There are also certain other organs besides these, which help, in common with all the others, to subserve the continuance of life, importing by their own means the proper supplies, as the stomach and the lungs, the latter fanning by respiration the fire at the heart, the former introducing the nourishment for the internal organs.

3. Our structure, then, being thus divided, we have carefully to mark that our faculty for life is not supported in any one way by some single organ, but nature, while distributing the means for our existence among several parts, makes the contribution of each individual necessary for the whole; just as the things which nature contrives for the security and beauty of life are also numerous, and differ much among themselves.

4. We ought, however, I think, first to discuss briefly the first beginnings of the things which contribute to the constitution of our life. As for the material of the whole body which serves as a common substratum for the particular members, it may for the present be left without remark; for a discussion as to natural substance in general will not be of any assistance to our purpose with regard to the consideration of the parts.

5. As it is then acknowledged by all that there is in us a share of all that we behold as elements in the universe— of heat and cold, and of the other pair of qualities of moisture and dryness— we must discuss them severally.

6. We see then that the powers which control life are three, of which the first by its heat produces general warmth, the second by its moisture keeps damp that which is warmed, so that the living being is kept in an intermediate condition by the equal balance of the forces exerted by the quality of each of the opposing natures (the moist element not being dried up by excess of heat, nor the hot element quenched by the prevalence of moisture); and the third power by its own agency holds together the separate members in a certain agreement and harmony, connecting them by the ties which it itself furnishes, and sending into them all that self-moving and determining force, on the failure of which the member becomes relaxed and deadened, being left destitute of the determining spirit.

7. Or rather, before dealing with these, it is right that we should mark the skilled workmanship of nature in the actual construction of the body. For as that which is hard and resistent does not admit the action of the senses (as we may see in the instance of our own bones, and in that of plants in the ground, where we remark indeed a certain form of life in that they grow and receive nourishment, yet the resistent character of their substance does not allow them sensation), for this reason it was necessary that some wax-like formation, so to say, should be supplied for the action of the senses, with the faculty of being impressed with the stamp of things capable of striking them, neither becoming confused by excess of moisture (for the impress would not remain in moist substance), nor resisting by extraordinary solidity (for that which is unyielding would not receive any mark from the impressions), but being in a state between softness and hardness, in order that the living being might not be destitute of the fairest of all the operations of nature— I mean the motion of sense.

8. Now as a soft and yielding substance, if it had no assistance from the hard parts, would certainly have, like molluscs, neither motion nor articulation, nature accordingly mingles in the body the hardness of the bones, and uniting these by close connection one to another, and knitting their joints together by means of the sinews, thus plants around them the flesh which receives sensations, furnished with a somewhat harder and more highly-strung surface than it would otherwise have had.

9. While resting, then, the whole weight of the body on this substance of the bones, as on some columns that carry a mass of building, she did not implant the bone undivided through the whole structure: for in that case man would have remained without motion or activity, if he had been so constructed, just like a tree that stands on one spot without either the alternate motion of legs to advance its motion or the service of hands to minister to the conveniences of life: but now we see that she contrived that the instrument should be rendered capable of walking and working by this device, after she had implanted in the body, by the determining spirit which extends through the nerves, the impulse and power for motion. And hence is produced the service of the hands, so varied and multiform, and answering to every thought. Hence are produced, as though by some mechanical contrivance, the turnings of the neck, and the bending and raising of the head, and the action of the chin, and the separation of the eyelids, that takes place with a thought, and the movements of the other joints, by the tightening or relaxation of certain nerves. And the power that extends through these exhibits a sort of independent impulse, working with the spirit of its will by a sort of natural management, in each particular part; but the root of all, and the principle of the motions of the nerves, is found in the nervous tissue that surrounds the brain.

10. We consider, then, that we need not spend more time in inquiring in which of the vital members such a thing resides, when the energy of motion is shown to be here. But that the brain contributes to life in a special degree is shown clearly by the result of the opposite conditions: for if the tissue surrounding it receives any wound or lesion, death immediately follows the injury, nature being unable to endure the hurt even for a moment; just as, when a foundation is withdrawn, the whole building collapses with the part; and that member, from an injury to which the destruction of the whole living being clearly follows, may properly be acknowledged to contain the cause of life.

11. But as furthermore in those who have ceased to live, when the heat that is implanted in our nature is quenched, that which has become dead grows cold, we hence recognize the vital cause also in heat: for we must of necessity acknowledge that the living being subsists by the presence of that, which failing, the condition of death supervenes. And of such a force we understand the heart to be as it were the fountain-head and principle, as from it pipe-like passages, growing one from another in many ramifications, diffuse in the whole body the warm and fiery spirit.