Richard Popkin ( The History of Scepticism ) writes of a crisis of skepticism in the fifteenth and sixteenth centuries: “With the rediscovery in the fifteenth and sixteenth centuries of writings of the Greek Pyrrhonist Sextus Empiricus, the arguments and views of the Greek sceptics became part of the philosophical core of the religious struggles then taking place. The problem of finding a criterion of truth, first raised in theological disputes, was then later raised with regard to natural knowledge,... Read more