The psychology of anger: its expressive drive.  Anger acknowledges that it is self-defeating, and wants that acknowledgment to be expressive.  "The fact that I am angry, when I know that self-restraint and not anger will command the respect I am justly owed, shows how angry I am at the injustice of the disrespect my anger aggravates."  Anger as a social mode, a communicative relationship between people: so Homer always represents it as occurring within societies: Achaian, Trojan, Olympian.  So that Achilleus's anger at Hektor, his refusal to treat with him, is itself a modality of social interaction, disguised as the rejection of social interaction.  Hence the acceptance of Priam's supplication, and Blanchot's "parole sublime": "Now you and I must remember our supper" (24.601).