Now, seeing that enslavement is considered a just or an unjust act according as the victims are friends or enemies, have you ever considered whether the case of ingratitude is analogous, ingratitude being unjust towards friends, but just towards enemies?
Indeed I have; and I think that it is always unjust not to show gratitude for a favour from whomsoever it is received, be he friend or enemy.
Memorabilia. Xenophon. Edgar Carew Marchant (Translator). Cambridge, MA. 1923.
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