“He who learns must suffer. And even in our sleep pain, which cannot forget, falls drop by drop upon the heart, until in our own despair, against our will, comes wisdom through the awful graces of God.”

Variant translations:
Zeus has led us on to know,
the Helmsman lays it down as law
that we must suffer, suffer into truth.
We cannot sleep, and drop by drop at the heart
the pain of pain remembered comes again,
and we resist, but ripeness comes as well.
From the gods enthroned on the awesome rowing-bench
there comes a violent love.
Robert Fagles, The Oresteia (1975)
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.
Edith Hamilton, The Greek Way (1930), pp. 61 and 194 ( Google Books https://books.google.com/books?id=D3QwvF3GWOkC&lpg=PA61&ots=BacvHvGm6e&dq=%22And%20in%20our%20own%20despite%2C%20against%20our%20will%2C%20Comes%20wisdom%22%20-kennedy&pg=PA194#v=onepage&q=%22our%20own%20despite%22&f=false)
Robert F. Kennedy quoted these lines in his speech announcing the assassination of Martin Luther King, Jr. on 4 April 1968. His version http://www.americanrhetoric.com/speeches/rfkonmlkdeath.html:
Even in our sleep, pain which cannot forget
falls drop by drop upon the heart
until, in our own despair, against our will,
comes wisdom through the awful grace of God.
Variant translations of πάθει μάθος:
By suffering comes wisdom.
The reward of suffering is experience.
Wisdom comes alone through suffering.
Source: Oresteia (458 BC), Agamemnon, lines 176–183, as translated by Ian Johnston ( Google Books https://books.google.com/books?id=qz1HpBZ1fTwC&lpg=PA13&ots=C7aohrZRF1&dq=Drips%20in%20our%20hearts%20as%20we%20try%20to%20sleep%2C&pg=PA13#v=onepage&q=Drips%20in%20our%20hearts%20as%20we%20try%20to%20sleep,&f=false)

Purification
One Minute Wisdom (1989)
Context: The Master insisted that what he taught was nothing, what he did was nothing.
His disciples gradually discovered that Wisdom comes to those who learn nothing, unlearn everything.
That transformation is the consequence not of something done, but of something dropped.

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 616.

Source: Julian and Maddalo http://www.bartleby.com/139/shel115.html (1819), l. 482

The Nazarene, 1939, p. 512.

Unity is Peace (1995)

Ibid., p. 59
The Book of Disquiet
Original: Durmo e desdurmo.
Do outro lado de mim, lá para trás de onde jazo, o silêncio da casa toca no infinito. Oiço cair o tempo, gota a gota, e nenhuma gota que cai se ouve cair.