We have to ask, that is, how Matter, this entity of ceaseless flux constituting the physical mass of the universe, could serve towards the immortality of the Kosmos. 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 Kosmos 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 constitution, again, there is a ceaseless shifting of particles- and that with outgoing loss- and yet the individual persists for a long time: where there is no question of an outside region, the body-principle cannot clash with soul as against the identity and endless duration of the living thing. Of these material elements- for example- fire, the keen and swift, cooperates by its upward tendency as earth by its lingering below; for we must not imagine that the fire, once it finds itself at the point where its ascent must stop, settles down as in its appropriate place, no longer seeking, like all the rest, to expand in both directions. No: but higher is not possible; lower is repugnant to its Kind; all that remains for it is to be tractable and, answering to a need of its nature, to be drawn by the Soul to the activity of life, and so to move to in a glorious place, in the Soul. Anyone that dreads its falling may take heart; the circuit of the Soul provides against any declination, embracing, sustaining; and since fire has of itself no downward tendency it accepts that guiding without resistance. The partial elements constituting our persons do not suffice for their own cohesion; once they are brought to human shape, they must borrow elsewhere if the organism is to be maintained: but in the upper spheres since there can be no loss by flux no such replenishment is needed. Suppose such loss, suppose fire extinguished there, then a new fire must be kindled; so also if such loss by flux could occur in some of the superiors from which the celestial fire depends, that too must be replaced: but with such transmutations, while there might be something continuously similar, there would be, no longer, a Living All abidingly self-identical.

Know, therefore, generally, my son, that all that is in Cosmos is being moved for increase or for decrease. Now that which is kept moving, also...

Whereas in all the rest of composed bodies, of each there is a certain number; for without number structure cannot be, or composition, or...

All things descend from Heaven to Earth, to Water and to Air. ’Tis Fire alone, in that it is borne upwards, giveth life; that which [is carried]...

I do not pass over Empedocles, who speaks thus physically of the renewal of all things, as consisting in a transmutation into the essence of fire,...

But He, the Father, full-filled with His ideas, did sow the lives as in a cave, willing to order forth the life with every kind of living. So He with ...

[Hermes:] Concerning Soul and Body, son, we now must speak; in what way Soul is deathless, and whence comes the activity in composing and dissolving...

It is intelligible rest that moves material motion in this way, since Cosmos is a sphere - that is to say, a head. And naught of head above's...