The Republic by Plato Part 3 Page 17

Neither is Phoenix, the tutor of Achilles, to be approved or deemed to have given his pupil good counsel when he told him that he should take the gifts of the Greeks and assist them; but that without a gift he should not lay aside his anger.

Neither will we believe or acknowledge Achilles himself to have been such a lover of money that he took Agamemnon’s gifts, or that when he had received payment he restored the dead body of Hector, but that without payment he was unwilling to do so.

Undoubtedly, he said, these are not sentiments which can be approved.

Loving Homer as I do, I hardly like to say that in attributing these feelings to Achilles, or in believing that they are truly attributed to him, he is guilty of downright impiety.