“There's an ocean of darkness and I drown in the night
till I come through the darkness to the ocean of light,
for the light is forever and the light it is free,
"And I walk in the glory of the light," said he.”

VIII. 485–486 (tr. Robert Fagles).
Iliad (c. 750 BC)

"A Generation" [Yidai ren]

"(What's So Funny 'Bout) Peace, Love, and Understanding" on The New Favourites of Brinsley Schwarz (1974); the song later became a hit as sung by Elvis Costello. ( Nicke Lowe performance http://www.youtube.com/watch?v=P7txCdLCP9U - Elvis Costello & Nick Lowe joint performance http://www.youtube.com/watch?v=dWdh7ERLb3E)
Context: As I walk through
This wicked world
Searchin' for light in the darkness of insanity,
I ask myself
Is all hope lost?
Is there only pain and hatred, and misery? And each time I feel like this inside,
Theres one thing I wanna know:
What's so funny 'bout Peace, Love, and Understanding?

Though Costello's cover became a hit, "(What's So Funny 'Bout) Peace, Love, and Understanding", was actually written by Nick Lowe.
Misattributed
Context: As I walk through
This wicked world
Searchin' for light in the darkness of insanity,
I ask myself
Is all hope lost?
Is there only pain and hatred, and misery?
And each time I feel like this inside,
There's one thing I wanna know:
What's so funny 'bout Peace, Love, & Understanding?

Variant: Walking with a friend in the dark is better than walking alone in the light.

A Wrinkle in Time (1962)
Context: Suddenly there was a great burst of light through the Darkness. The light spread out and where it touched the Darkness the Darkness disappeared. The light spread until the patch of Dark Thing had vanished, and there was only a gentle shining, and through the shining came the stars, clear and pure.

Variant: The light came into the darkness, and the darkness did not understand it, but that no longer mattered because the light was now obliteration the darkness.
Source: House

Not knowing (1869).