" The truth to reconcile these truths he found in the experience of men, which the men of his generation must have realized far beyond others, that pain and error have their purpose and their use: they are steps of the ladder of knowledge: 'God, whose law it is that 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.' (Aeschylus, Agamemnon) "

― Edith Hamilton , The Greek Way