“Repute is never transmitted with certainty; all things that she reports are exaggerated. Even our glory, although it rests on a solid foundation, is greater in name than in fact.”

As quoted in Saturday Review (25 August 1962)
Will Rogers, Ambassador of Good Will, Prince of Wit and Wisdom (1935)
Variant: People often ask me, 'Will, where do you get your jokes?' I just tell 'em, 'Well, I watch the government and report the facts, that is all I do, and I don't even find it necessary to exaggerate.
Variant: I don't make jokes. I just watch the government and report the facts.

Section 83
The True Believer (1951), Part Three: United Action and Self-Sacrifice

Source: What Entropy Means to Me (1972), Chapter 2 “Next: The Radishes of Doom” (p. 25).

Zend explaining the Spawn of Dagon to Elak
Short fiction, The Spawn Of Dagon (1938)
Context: "They dare'd not invade the palace while the globe shone, for the light-rays would have killed them. … This island-continent would have gone down beneath the sea long ago if I hadn't pitted my magic and my science against that of the children of Dagon. They are masters of the earthquake, and Atlantis rests on none too solid a foundation. Their power is sufficient to sink Atlantis forever beneath the sea. But within that room" — Zend nodded toward the curtain that hid the sea-bred horrors — "in that room there is power far stronger than theirs. I have drawn strength from the stars, and the cosmic sources beyond the universe. You know nothing of my power. It is enough — more than enough — to keep Atlantis steady on its foundation, impregnable against the attacks of Dagon's breed. They have destroyed other lands before Atlantis."

As quoted in How the Allies Won (1995) by Richard Overy, citing Hitler: The Man and the Military Leader (1972) by P.E. Schramm
Other remarks

Statement from unpublished notes for the Preface to Opticks (1704) quoted in Never at Rest: A Biography of Isaac Newton (1983) by Richard S. Westfall, p. 643

Variant: There's no greater misfortune than dying alone.
Source: Love in the Time of Cholera

Variant: The report of my death was an exaggeration.