Cicero's Tusculan Disputations / Also, Treatises On The Nature Of The Gods, And On The Commonwealth

by Marcus Tullius Cicero

Every division, then, of the world (and I shall touch upon the most considerable) is sustained by heat; and first it may be observed in earthly substances that fire is produced from stones by striking or rubbing one against another; that “the warm earth smokes”[¹²¹] when just turned up, and that water is drawn warm from well-springs; and this is most especially the case in the winter season, because there is a great quantity of heat contained in the caverns of the earth; and this becomes more dense in the winter, and on that account confines more closely the innate heat which is discoverable in the earth.

X. It would require a long dissertation, and many reasons would require to be adduced, to show that all the seeds which the earth conceives, and all those which it contains having been generated from itself, and fixed in roots and trunks, derive all their origin and increase from the temperature and regulation of heat. And that even every liquor has a mixture of heat in it is plainly demonstrated by the effusion of water; for it would not congeal by cold, nor become solid, as ice or snow, and return again 265to its natural state, if it were not that, when heat is applied to it, it again becomes liquefied and dissolved, and so diffuses itself. Therefore, by northern and other cold winds it is frozen and hardened, and in turn it dissolves and melts again by heat. The seas likewise, we find, when agitated by winds, grow warm, so that from this fact we may understand that there is heat included in that vast body of water; for we cannot imagine it to be external and adventitious heat, but such as is stirred up by agitation from the deep recesses of the seas; and the same thing takes place with respect to our bodies, which grow warm with motion and exercise.

And the very air itself, which indeed is the coldest element, is by no means void of heat; for there is a great quantity, arising from the exhalations of water, which appears to be a sort of steam occasioned by its internal heat, like that of boiling liquors. The fourth part of the universe is entirely fire, and is the source of the salutary and vital heat which is found in the rest. From hence we may conclude that, as all parts of the world are sustained by heat, the world itself also has such a great length of time subsisted from the same cause; and so much the more, because we ought to understand that that hot and fiery principle is so diffused over universal nature that there is contained in it a power and cause of generation and procreation, from which all animate beings, and all those creatures of the vegetable world, the roots of which are contained in the earth, must inevitably derive their origin and their increase.

XI. It is nature, consequently, that continues and preserves the world, and that, too, a nature which is not destitute of sense and reason; for in every essence that is not simple, but composed of several parts, there must be some predominant quality—as, for instance, the mind in man, and in beasts something resembling it, from which arise all the appetites and desires for anything. As for trees, and all the vegetable produce of the earth, it is thought to be in their roots. I call that the predominant quality,[¹²²] which 266the Greeks call ἡγεμονικόν; which must and ought to be the most excellent quality, wherever it is found. That, therefore, in which the prevailing quality of all nature resides must be the most excellent of all things, and most worthy of the power and pre-eminence over all things.

Now, we see that there is nothing in being that is not a part of the universe; and as there are sense and reason in the parts of it, there must therefore be these qualities, and these, too, in a more energetic and powerful degree, in that part in which the predominant quality of the world is found. The world, therefore, must necessarily be possessed of wisdom; and that element, which embraces all things, must excel in perfection of reason. The world, therefore, is a God, and the whole power of the world is contained in that divine element.

The heat also of the world is more pure, clear, and lively, and, consequently, better adapted to move the senses than the heat allotted to us; and it vivifies and preserves all things within the compass of our knowledge.

It is absurd, therefore, to say that the world, which is endued with a perfect, free, pure, spirituous, and active heat, is not sensitive, since by this heat men and beasts are preserved, and move, and think; more especially since this heat of the world is itself the sole principle of agitation, and has no external impulse, but is moved spontaneously; for what can be more powerful than the world, which moves and raises that heat by which it subsists?

XII. For let us listen to Plato, who is regarded as a God among philosophers. He says that there are two sorts of motion, one innate and the other external; and that that which is moved spontaneously is more divine than that which is moved by another power. This self-motion he places in the mind alone, and concludes that the first principle of motion is derived from the mind. Therefore, since all motion arises from the heat of the world, and that heat is not moved by the effect of any external impulse, but of its own accord, it must necessarily be a mind; from whence it follows that the world is animated.

On such reasoning is founded this opinion, that the world is possessed of understanding, because it certainly has more perfections in itself than any other nature; for 267as there is no part of our bodies so considerable as the whole of us, so it is clear that there is no particular portion of the universe equal in magnitude to the whole of it; from whence it follows that wisdom must be an attribute of the world; otherwise man, who is a part of it, and possessed of reason, would be superior to the entire world.

And thus, if we proceed from the first rude, unfinished natures to the most superior and perfect ones, we shall inevitably come at last to the nature of the Gods. For, in the first place, we observe that those vegetables which are produced out of the earth are supported by nature, and she gives them no further supply than is sufficient to preserve them by nourishing them and making them grow. To beasts she has given sense and motion, and a faculty which directs them to what is wholesome, and prompts them to shun what is noxious to them. On man she has conferred a greater portion of her favor; inasmuch as she has added reason, by which he is enabled to command his passions, to moderate some, and to subdue others.