As early as Xenophon, ingratitude has seen as a cause of sedition, and during the middle ages the social and political context of feudalism strengthened this link. Xenophon wrote, “And they [the Persians] bring one another to trial also charged with an offense for which people hate one another most but go to law least, namely, that of ingratitude; and if they know that any one is able to return a favour and fails to do so, they punish him... Read more