Source: V. (1963), Chapter Seven, Part VII
Context: He had decided long ago that no Situation had any objective reality: it only existed in the minds of those who happened to be in on it at any specific moment. Since these several minds tended to form a sum total or complex more mongrel than homogeneous, The Situation must necessarily appear to a single observer much like a diagram in four dimensions to an eye conditioned to seeing the world in only three. Hence the success or failure of any diplomatic issue must vary directly with the degree of rapport achieved by the team confronting it. This had led to the near obsession with teamwork which had inspired his colleagues to dub him Soft-show Sydney, on the assumption that he was at his best working in front of a chorus line.
But it was a neat theory, and he was in love with it. The only consolation he drew from the present chaos was that his theory managed to explain it.
“If anything ever happened to any one who eagerly longed and never hoped, that is a true pleasure to the mind.”
CVII, lines 1–2
Carmina
Original
Si quicquam cupido optantique optigit umquam insperanti, hoc est gratum animo proprie.
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Gaio Valerio Catullo 25
Latin poet -84–-54 BCRelated quotes
Source: Letters of Katherine Anne Porter

“There's nothing that's ever happened in the world that didn't start in one human mind.”
2000s, In Depth with Tom Clancy (2002)

Source Book in Ancient Philosophy (1907), The Golden Sayings of Democritus

Notes, 1985; as cited on collected quotes on the website of Gerhard Richter: 'on Other subjects' https://www.gerhard-richter.com/en/quotes/other-aspects-6
1980's

“Ever let the Fancy roam,
Pleasure never is at home.”
Actually the opening lines of Keats's "Fancy" (1820).
Misattributed

“Ever let the Fancy roam,
Pleasure never is at home.”
"Fancy", l. 1
Poems (1820)