Zeus, who guided mortals to be wise,
has established his fixed law—
wisdom comes through suffering.
Trouble, with its memories of pain,
drips in our hearts as we try to sleep,
so men against their will
learn to practice moderation.
Favours come to us from gods
seated on their solemn thrones—
such grace is harsh and violent.

The Oresteia, translated by Ian Johnston (2007). Google Books - Agamemnon

https://books.google.com/books?id=qz1HpBZ1fTwC&lpg...