Human reason is not the objective standard for an ethical life. The pursuit of virtue proves to be a moral ation independent of the fact that is also in one's interest, he argues. If living in agreement with nature is the goal, then we must assume nature is inherently purposeful and supports values such as those found in stoic theory.
This podcast episode refers to the blog post on The Discipline of Action, which is being completely updated.
Blog posts referenced in this episode:
The Connection Between Physics and Ethics
Retaining the Soul of Stoicism