Revenge cycles that never resolve
Every act of violence in the play is framed as payback for a previous one. Clytemnestra kills Agamemnon for Iphigenia. Aegisthus claims his own grievance. The chorus warns Orestes will come. No one breaks the pattern, and the play does not pretend anyone will.
Pride as a path to destruction
Agamemnon's willingness to walk on the purple robes shows how pride works in this play: it does not announce itself, it just makes you do things you know are wrong. The gods punish this kind of overreach, and Clytemnestra uses it as a weapon.
The failure of prophecy to prevent disaster
Cassandra knows exactly what will happen and says so. It changes nothing. Aeschylus uses her to show that knowledge without power or belief is useless. Tragedy happens not because people are ignorant but because they cannot act on what they know.
Gender and power
Clytemnestra holds power in a world that does not expect women to. The chorus is repeatedly unsettled by her authority. She uses flattery, manipulation, and finally violence to get what she wants. The play watches her do it without fully condemning or praising her.
The weight of inherited guilt
The house of Atreus is already cursed before the play begins. Agamemnon inherits crimes he did not commit. His children will inherit his. Aeschylus treats family history as something inescapable, a force that shapes what people do even when they try to choose differently.