 The two main speakers divide on these questions in an unexpected way: Socrates, who believes that virtue cannot be taught, and that he does not teach it, defends the unity of all virtues with wisdom, even courage; Protagoras, who believes that virtue can be taught, and that he teaches it, denies that courage is wisdom or any sort of knowledge. Moreover, Socrates, who elsewhere rejects hedonism, seems to identify virtue with a hedonic calculus in this dialogue, through an argument that leads to his famous claim that of  acrasia  (weakness of will) is impossible.