Head of the New Academy who developed the most sophisticated ancient skepticism — arguing that no impression is cataleptic (certain) — and the doctrine of pithanon (probable/plausible) as a guide to action without certainty.
Probabilism: in the absence of certainty, the plausible (pithanon) serves as a practical guide; this is not assent to truth but practical acceptance. Demolished Stoic theology through dilemmatic arguments about divination. Famous for arguing both for and against the justice of Roman imperialism in 155 BCE Rome.
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