Plotinus,
Enneads — The Heavenly System
“ And our answer is, ‘Because the flux is not outgoing’: where there is motion within but not outwards and the total remains unchanged, there is neither growth nor decline, and thus the Cosmos never ages.We have a parallel in our earth, constant from eternity to pattern and to mass; the air, too, never fails; and there is always water: all the changes of these elements leave unchanged the Principle of the total living thing, our world. In our own construction, again, there is a ceaseless shifting of particles—and that with outgoing loss—and yet the individual persists for a long time ”
