This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Ekpyrosis is Stoicism's answer to a physical question its own logic forced upon it: if the cosmos is a single living, rational body sustained by an active divine fire, what happens when that fire's work is, in some sense, complete? Zeno of Citium's original physics already pointed toward periodic conflagration, and Chrysippus, the school's great systematizer, gave the doctrine its fullest defense. At the appointed turn, everything that exists, the other three elements along with every living thing and every event that has taken place, resolves back into pure fire, the substance the Stoics identified with both the Logos, divine reason, and with Zeus. From that fire a new cosmos is born through palingenesis, unfolding again through earth, water and air into a complete world of stars and living things, beginning the whole sequence anew.
The doctrine was never uncontested within the school that produced it. Panaetius of Rhodes, heading the Stoa in the second century BCE, broke with his predecessors and denied the conflagration outright, an unusually direct dissent from a school not otherwise known for public disagreement on its core physics. Three centuries later, Marcus Aurelius could still write as though the question remained genuinely open, weighing ekpyrosis against an alternative atomistic dispersal rather than treating either as settled.
The hardest question the doctrine raises, whether the reconstituted world repeats every event and every person exactly as before or only reproduces the same overall pattern, was never answered uniformly by the surviving sources, and ancient critics outside the school pressed the identical version as its most vulnerable point.