Hello, 

I want to use this quotation at the head of chapter of a book I am
writing and I want to get it right! I hope, perhaps, you can help? It
is from Aeschylus? The Oresteia. ?Nothing obliges us to learn what we
do not want to know except pain, truth comes with pain ? this is how
the gods disclose their love. The truth has to be melted out of our
stubborn live by suffering.? Firstly, I cannot find it in the
well-known Ted Hughes edition - which edition does it come from?
Secondly, who says it and in which of the three plays within the whole
does it appear? Finally, have I set it out correctly - is it as it
appears in the play? Many thanks, R K D Watkins-Wright.

Here's some possibilities:

http://www.gutenberg.org/files/14417/14417-8.txt

Zeus the Guide, who made man turn
Thought-ward, Zeus, who did ordain
Man by Suffering shall Learn.
So the heart of him, again
Aching with remembered pain,
Bleeds and sleepeth not, until
Wisdom comes against his will.
'Tis the gift of One by strife
Lifted to the throne of life.