" Zeus, whose will has marked for man
The sole way where wisdom lies;
Ordered one eternal plan:
Man must suffer to be wise.
Head-winds heavy with past ill
Stray his course and cloud his heart:
Sorrow takes the blind soul's part -
Man grows wise against his will.
For powers who rule from thrones above
By ruthlessness commend their love. "

― Aeschylus , The Oresteia: Agamemnon, The Libation Bearers, The Eumenides