Logos functions as criterion in the Stoic perspective because it provides a standard beyond appetite, panic, and impulse by asking whether judgment accords with reason and nature.
Criterion in Stoicism is not mere personal preference. It is grounded in logos.
Logos is the rational structure of reality. To judge well is to align one’s reasoning with what is actually the case and with what is fitting within that order.
This is what makes Stoicism more than coping strategy. It is a serious theory of criterion. The standard is not what feels easier, safer, or more flattering. The standard is what accords with reason, nature, and virtue.
This gives the Stoic perspective a direct mapping to criterion in the discernment model. Without such a standard, discernment collapses into impulse or fashion.
With logos, Stoicism offers a stable answer to the question: by what measure is this judgment to be called good?