“Thought is only a gleam in the midst of a long night. But it is this gleam which is everything”

— Henri Poincaré , book The Value of Science

Source: The Value of Science (1905), Ch. 11: Science and Reality
Context: All that is not thought is pure nothingness; since we can think only thought and all the words we use to speak of things can express only thoughts, to say there is something other than thought, is therefore an affirmation which can have no meaning.
And yet—strange contradiction for those who believe in time—geologic history shows us that life is only a short episode between two eternities of death, and that, even in this episode, conscious thought has lasted and will last only a moment. Thought is only a gleam in the midst of a long night. But it is this gleam which is everything.<!--p.142

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Henri Poincaré 49

French mathematician, physicist, engineer, and philosopher … 1854–1912

George Woodcock (1912–1995) Canadian writer of political biography and history, an anarchist thinker, an essayist and literary critic

"Black Flag" in Collected Poems (1983)
Context: For out of black
soul's night have stirred
dawn's cold gleam,
morning's singing bird. Let black day die,
let black flag fall,
let raven call,
let new day dawn
of black reborn.

“Best blessing of all is water, And gold like a fiery flame gleaming at night,
Supreme amidst the pride of lordly wealth.”

Pindar book Olympic Odes

Ἄριστον μὲν ὕδωρ, ὁ δὲ χρυσὸς αἰθόμενον πῦρ ἅτε διαπρέπει
νυκτὶ μεγάνορος ἔξοχα πλούτου.
Olympian 1, line 1-2; page 1
Closer translation:
Best is water, but gold stands out blazing like fire
at night beyond haughty wealth.
Olympian Odes (476 BC)

“Hope, like the gleaming taper's light,
Adorns and cheers our way;
And still, as darker grows the night,
Emits a brighter ray.”

Oliver Goldsmith (1728–1774) Irish physician and writer

Act II.
The Captivity, An Oratorio (1764)

“But no clouds in a red sky promised daylight's return, nor in lessening shadows did a long twilight gleam with reflected sun. Black night that no ray can pierce comes ever denser from earth, veiling the heavens.”
Sed nec puniceo rediturum nubila caelo promisere jubar, nec rarescentibus umbris longa repercusso nituere crepuscula Phoebo: densior a terris et nulli peruia flammae subtexit nox atra polos.

Statius book Thebaid

Source: Thebaid, Book I, Line 342

“The sky was dark, the night was black, obscurity reigned, the gleam of the wolves eyes was the only light that came to sight, the howling of the jackal was the only sound to be heard, conspiracies were in the making while slanderers and the malicious were busily chattering”

Ali Shariati (1933–1977) Iranian academic and activist

Quote in: Ali Rahnema An Islamic Utopian: A Political Biography of Ali Shariati. (2000), p. 258
Rahnema commented that "Shariati did not believe he had any chance of returning to Ershad and evaluated his situation in a poetical and macabre fashion".