In On the Nature of the Gods Cicero explains his own metaphysical interpretation of the universe. The soul of the interpretation is pantheistic, and he notably relies on many keen syllogisms about the universe to support his explanation.
“How is it that the tides of the open sea and the narrow straits move to the waxing and waning of the moon, while the unequal orbits of the stars stay constant with each full turning of the heavens? This harmony of all parts of the universe is impossible unless they are held together by a single, divine, all-pervading spirit.
“It’s all but impossible to pollute a flowing stream, easy enough to poison a cistern. So, too, a rush of eloquence washes away objections, while a thin trickle of reasoning has a hard time protecting itself.
“Everything that lives, whether animal or product of the earth, lives thanks to the heat within it – from which we should understand that elemental heat contains a vital power that permeates the entire universe.
“It will be possible to infer, as well, that the universe possesses intelligence, for it is surely superior to any one element. Just as every individual part of our body is inferior to ourselves, so the universe must be greater than any part of the universe. But if that’s the case, then the universe must be wise, for if it weren’t, then man, who is part of the universe, would, in that he has a share of reason, be greater than the whole universe.
“Nothing can move to such a patterned rhythm without design. The orderliness of the constellations and their steadfast movement through eternity are not simply automatic…nor the work of fortune, which loves variety and rejects consistency. It follows therefore that they move of their own volition, thanks to their own judgement and divine power.
*All excerpts have been taken from Cicero: On Living and Dying Well, Penguin Classics.