These posts differentiate traditional Stoicism from the various modern iterations that diverge, often dramatically, from the essential elements of Stoic philosophy as historically understood. The assertion of traditional Stoicism is not that the philosophical system cannot change and evolve, nor does it assert that moderns must assent to everything the ancients did. Instead, traditional Stoicism rests on the demonstrable fact that the ancient Stoics built their philosophical theory and practice around a set of fundamental assumptions about the nature of humankind and the nature of the cosmos. Those assumptions define Stoicism and empower its practice to affect change in lives. Clearly, our understanding of both human nature and the cosmos has increased over time and those new facts can be assimilated into the framework of the original system. However, in our current secular age, many want to abandon fundamental aspects of the framework itself because they conflict with their assumed worldview. The ancient Stoics denied that their system could be changed in this manner; traditional Stoics agree. Traditional Stoicism asserts that we must avoid the impulse to change Stoic practice into something which is no longer recognizable as Stoicism simply to make it more palatable for moderns.