He argued the wisest response to any claim is to suspend judgment entirely

Pyrrho of Elis, traveling with Alexander the Great's army into India in the 4th century BC, concluded that we can never know how things really are — only how they appear to us. His answer wasn't despair but 'epoché', suspending judgment altogether, which he believed led to tranquility rather than paralysis. He wrote nothing down himself; his ideas survive through his student Timon.

— Diogenes Laërtius, Lives of the Eminent Philosophers, Book IX — Pyrrho lived c. 360–270 BC