Use when a strategy session or research team is prematurely locked into a dogmatic narrative and needs a self-erasing devil's-advocate purge to restore cognitive flexibility. ---

Sceptics balance every dogmatic claim with an equally strong counter-claim to trigger suspension of judgment (*epoche*); their own sceptical maxim then flushes itself out like a laxative, and mental tranquillity (*ataraxia*) follows suspension automatically like a shadow. Diogenes synthesizes the mature Pyrrhonian system of Timon and Aenesidemus around three linked mechanisms: 1. **Equipollence (*isostheneia*):** For every dogmatic claim about the hidden nature of things, the sceptic marshals an opposed argument of equal persuasive weight ("expressions are equipollent") using the Ten Modes of Aenesidemus and Five Modes of Agrippa. 2. **Self-Eliminating Purge:** When dogmatists object that "we affirm nothing" or "every reason has an opposing reason" is itself a positive dogma, the sceptics deploy the medical analogy of the *kathartikon* ("cathartic medicines"): the sceptical formula is not a permanent doctrinal resident in the mind, but a purgative drug that flushes out dogmatic humours and then expels itself along with them. 3. **Shadow-Tranquillity:** Once judgment is suspended (*epoche*) on all non-evident matters, "tranquillity of mind" (*ataraxia*) is not manufactured by willpower; it follows suspension automatically "like its shadow," while the sceptic lives day-to-day by evident appearances, bodily necessity, and local custom. **[INTERPRETATION: PRISCA THEOLOGIA / ESOTERIC]** When Pyrrhonian texts resurfaced in the Renaissance (via Ambrogio Traversari's Latin translation of Diogenes Laertius and Henri Estienne's 1562 printing of Sextus Empiricus), thinkers from Gianfrancesco Pico della Mirandola (*Examen Vanitatis*) to Montaigne seized upon the "cathartic medicine" and "shadow of tranquillity" as the ultimate weapon of *docta ignorantia* (learned ignorance) and mystical *via negativa*. In this esoteric-fideist reception, Pyrrho's self-erasing purge was read as the intellectual preparation for illumination: human discursive reason (*ratio*) is a Babel of mutually cancelling contradictions (the Ten and Five Modes) that must be used to annihilate its own pride. Once the cathartic drug of scepticism flushes the mind clean of Aristotelian and Stoic dogmas and then dissolves itself, the soul enters a sacred silence (*epoche*) upon which divine peace descends unforced, like a shadow cast by light.