It is unlikely that the universal Organism is composed of universal
elements. That terrestrial animals are thus composed is certain; but
to introduce the terrestrial element into the composition of the
heaven would be to admit something contrary to nature, and to the
order thereby established. (Epicurus's opinion that) the stars carry
terrestrial bodies along in their rapid flight is undemonstrable.
Besides, the presence of the earth would be an obstacle to the shine
and splendor of the celestial fire.