Plotinos: Complete Works, v. 3 In Chronological Order,...

2. An admission that the heaven and the stars are perpetual in their individuality, while sublunary things are perpetual only in their form, would demand demonstration that a corporeal being can preserve its individuality as well as its form, even though the nature of bodies were a continual fluctuation. Such is the nature that the physical philosophers,202 and even Plato himself, attribute not only to sublunar bodies, but even to celestial ones. "For," asks (Plato203), "how could corporeal and visible objects subsist ever immutable and identical with themselves?" (Plato) therefore admits the opinion of Heraclitus that "the sun itself is in a state of perpetual becoming (or, growth)."204