The Suspended Scale
Pyrrho of Elis, Sextus Empiricus, and the Calm That Follows Equipollence
Around 200 CE, the Greek empiricist physician Sextus Empiricus opened his philosophical handbook Outlines of Pyrrhonism with an incident from a fourth-century BCE painting studio. The celebrated Hellenistic artist Apelles of Kos was painting a warhorse returning from battle. He had rendered the horse's muscular flank, hooves, and flared nostrils with lifelike accuracy, but he could not capture the fleck of bloody foam gathering around the iron bit in the horse's mouth. Every time he applied fine bristle brushes to layer white and red pigment by hand, the foam looked stiff and artificial. Driven to exasperation by the failure of his deliberate technique, Apelles gave up, seized the wet sponge he used to wipe his brushes clean, and flung it at the wooden panel. Where the sponge struck the board, the mixed pigments left an exact, natural imprint of horse foam.
To Sextus Empiricus, Apelles's sponge illustrated the central discovery of Pyrrho of Elis, who had traveled east with Alexander the Great's military campaign into Taxila and northwest India between 327 and 325 BCE. In India, according to the biographer Diogenes Laertius, Pyrrho conversed with ascetics whom the Greeks called gymnosophists (naked philosophers) and returned to Elis with a radical diagnosis of human anxiety. Every rival school in the Greek world—Platonists, Aristotelians, Epicureans, and Stoics—assumed that mental peace (ataraxia) could be won only by discovering the true dogmatic blueprint of nature and regulating human life according to its hidden essences.
Pyrrho and Sextus discovered the exact opposite. The relentless effort to establish dogmatic certainty about hidden realities is the primary engine of mental disturbance. Whoever holds a dogmatic conviction that a particular status, possession, or metaphysical doctrine is intrinsically good or evil by nature is doubly tormented: when lacking the prized object, the believer is consumed by frantic craving; when possessing it, the believer is haunted by terror of losing it.
To dismantle this anxiety at its root, Pyrrhonian skepticism operated as a three-stage subtractive engine:
- * Isostheneia (Equipollence): For every dogmatic proposition about the hidden nature of things—whether derived from sensory appearance or deductive syllogism—the skeptic sets up an opposing argument of equal evidentiary weight. Deploying the Ten Modes of Aenesidemus (which show how sensory appearances vary across species, organs, and conditions) alongside the Five Modes of Agrippa (which trap every dogmatic proof inside infinite regress, circularity, or arbitrary axiom), the investigator balances the two sides of the scale until neither claim outweighs the other.
- * Epoche (Suspension of Judgment): Confronted with two mutually cancelling arguments of identical force, the analytical intellect can neither affirm nor deny. Its grasping motion comes to a standstill.
- * Ataraxia (Untroubled Quietness): The instant the intellect stops straining to adjudicate hidden essences, the anxiety that accompanied dogmatic striving collapses on its own, following suspension of judgment as automatically as a shadow follows a body in sunlight.
Sextus compared this skeptical formula to a self-eliminating purgative medicine in humoral pharmacology: unlike food, which stays inside the body and adds bulk, a purgative flushes toxic humors from the digestive tract and then expels itself along with them. Nor did suspending metaphysical judgment paralyze everyday life. As a practicing medical doctor, Sextus treated patients daily by following immediate appearances, bodily hunger and thirst, local laws, and empirical craft—subtracting only the extra layer of dogmatic opinion. When Michel de Montaigne had fifty-seven Greek and Latin maxims carved into the oak ceiling beams of his library tower near Bordeaux in 1576, he drew them directly from the newly printed Renaissance editions of Sextus Empiricus.