Tracing the concept of hexis contained in the Nicomachean Ethics, Jacopo Zabarella assumes that no disposition is a natural faculty originally present in man, and considers habitus as an acquired attitude that can be applied to ethical and theoretical virtues. With regard to the different mode of acquisition, Zabarella distinguishes theoretical habits, which are related to demonstrative procedures concerning necessary objects and transmitted through teaching, from ethical habits dealing with the contingent sphere of praxis, and consolidated through the reiteration of (...) good actions. As far as habits are forged by individual behaviour, leading to the consolidation of permanent dispositions, a problematic issue emerges, concerning repeated actions that can be virtuous or vicious as the result of personal moral choices. Through his re-reading of Aristotle, Zabarella underlines the role of personal responsibility in action. Although not new to the philosophical tradition, this approach is particularly significant, if considered as a philosophical answer to the issues on free will and self-determination raised by the theological approach of Reformation. The presence in the 16th century of the concept of habitus, which is characteristic of the Nicomachean Ethics, also testifies the persistence of Aristotelian practical philosophy. (shrink)