All things continually revolve and are forever changing; they pass from one position to another in accordance with natural and unalterable laws: after they have completed a certain circuit in a fixed space of time, they begin again the path which they had previously trodden. Be not surprised, then, if the human mind, which is formed from the same seeds as the heavenly bodies, delights in change and wandering, since the divine nature itself either takes pleasure in constant and exceeding swift motion or perhaps even preserves its existence thereby.