Abstract
This article considers two alternative responses to the question of the motivation behind the suspensive argumentation developed by the Pyrrhonic version of the ancient scepticism and also shows their respective difficulties: a) the therapeutic motivation, that takes the suspension of assent for the condition to reach not only a state of mental tranquillity concerning matters of opinion but also a moderate attitude towards passions; b) the epistemic motivation, which states that the suspension corresponds to the unique possibility to preserve philosophical life in the absence of rational criteria to decide among competing philosophical theories. The latter kind of motivation, which consists in creating propitious conditions for the search for the truth, has nothing to do with the methodic motivation characterizing the modern reception of ancient scepticism. Although this motivation was not present in the Pyrrhonic scepticism, it could not be unknown to the academic sceptics because of their Socratic origins.