The essential intent of this paper is to elucidate the meaning of the term pros hêmas appearing inside the Aristotelian definition of moral virtue. In this definition, after having established the genus of virtue as a disposition ( hexis), Aristotle offers his specific difference, i.e., being a mean pros hêmas (relative to us). What is the meaning of “relative to us”? Relative to us as specie? Relative to the moral agent? Relative to the character? Every one of these possibilities will be analyzed, in an attempt todemonstrate that none of them fulfills the Aristotelian intent, because us in the expression “relative to us” seems to point out to circumstances in which the agent is involved with, what seems to be asserted in several passages of the Nicomachean Ethics