Just a couple of observations on comments from the above article:
"The Stoics taught materialism, in which everything - including God and words - is material."
Not quite true, as matter is of the profane and purer kind, the former being mundane matter and the purer being pneuma. The profane matter proceeds from the purer matter, which is the true essence of Zeus, and it's the profane matter which is destroyed during the conflagration, reabsorbed into Zeus to be remade. Thus, Zeus is not the world per se, but the world is the visible portion of him, his immanent aspect; Zeus still has transcendent qualities. The human body is the best example that I can give- the outer shell is the apparent, visible aspect of the person, yet his or her true self is much more deeply-seated, being in the heart, mind, and soul. These qualities are sparks of Zeus' pneuma, just as wisps of flame licking off of a bonfire.
"The Stoics held a cyclical view of history, in which the world was once fire and would become fire again. The cycle of conflagration will then be repeated. Since this is the best of all possible worlds, each world cycle is exactly the same - Socrates will teach again, you will read this web page again."
This is the conflagration or ekpyrosis. The only eternal form of existence is fire, or active energy, which is Zeus and Mind. This cosmic, spiritual fire (or light) permeates all of existence, hence Stoicism can be called pantheistic, and gives rise to the other elements of air, earth, and water. At some point in time, Zeus will withdraw all of his fiery energy once more into a single point, reabsorbing his essence and causing the ekpyrosis- and, again, he'll cause it to explode outward again in an endless cycle of creation, destruction, and reabsorption.