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Fire, indeed, when it is gathered into one thing, generates air, but air generates water, and water earth. From earth, also, there is the same circuit of mutation, as far as to fire, from whence it began to be changed. But fruits, and most plants that derive their origin from a root, receive the beginning of their generation from seeds. When, however, they bear fruit and arrive at maturity, again they are resolved into seed, nature producing a complete circulation from the same to the same.
But men and other animals, in a subordinate degree, change the universal boundary of nature; for in these there is no periodical return to the first age, nor is there an antiperistasisA reciprocal change or counter-action. of mutation into each other, as there is in fire and air, water and earth. But the mutations of their ages being accomplished in a four-fold circleThis four-fold mutation of ages in the human race consists of the infant, the lad, the man, and the old man, as is well observed by Theo of Smyrna. See my Theoretic Arithmetic, p. 189., they are dissolved, and again return to existence. These, therefore, are the signs and indications that the universe, which comprehends [all things], will always endure and be preserved, but that its parts, and such things in it as are supervenient, are corrupted and dissolved.
Further still, it is credible that the universe is without a beginning, and without an end, from its