In the "Oresteia" - the only trilogy in Greek drama which survives from antiquity - Aeschylus took as his subject the bloody chain of murder and revenge within the royal family of Argos. Moving from darkness to light, from rage to self-governance, from primitive ritual to civilized institution, its spirit of struggle and regeneration is eternal.
He who learns must suffer
And even in our sleep pain that cannot forget
Falls drop by drop upon the heart,
And in our own despite, against our will,
Comes wisdom to us by the awful grace of God.