“Totally without hope one cannot live. To live without hope is to cease to live. Hell is hopelessness. It is no accident that above the entrance to Dante's hell is the inscription: "Leave behind all hope, you who enter here.”

Source: Work Without Hope (1825), l. 9.
Context: Bloom, O ye Amaranths! bloom for whom ye may,
For me ye bloom not! Glide, rich streams, away!
With lips unbrightened, wreathless brow, I stroll:
And would you learn the spells that drowse my soul?
Work without Hope draws nectar in a sieve,
And Hope without an object cannot live.

Source: "Die Menschen können nicht ohne Hoffnung leben" (one of his last interviews), Rhein-Neckar-Zeitung (February 11, 2002)

Source: The Keys of the Kingdom (1941), p. 207

Source: Rose Under Fire

tr. Lindsay 1925, Perseus http://www.perseus.tufts.edu/hopper/text.jsp?doc=Aristoph.+Lys.+1014
Lysistrata, line 1038-1039
Lysistrata (411 BC)

Source: 1Q84

L'amour aussi bien que le feu ne peut subsister sans un mouvement continuel; et il cesse de vivre dès qu'il cesse d'espérer ou de craindre.
Maxim 75.
Reflections; or Sentences and Moral Maxims (1665–1678)

Source: Books, Beyond Order (2021), p. 133

Part i, canto ii.
Lucile (1860)