“That most knowing of persons – gossip.”
Letter XLIII: On the relativity of fame, line 1.
Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter XLIII: On the relativity of fame
Original
Is qui scit plurimum, rumor.
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Seneca the Younger 225
Roman Stoic philosopher, statesman, and dramatist -4–65 BCRelated quotes

“First law of gossip—there’s no point knowing something if somebody else doesn’t know you know it.”
Source: Moon Over Soho (2011), Chapter 11, “Those Foolish Things” (p. 239)

Source: The Happiness Hypothesis: Finding Modern Truth in Ancient Wisdom (2005), p. 55.

“Gossip is charming! History is merely gossip. But scandal is gossip made tedious by morality.”
Cecil Graham http://books.google.com/books?id=8SzYgCNz-vwC&q="Gossip+is+charming+History+is+merely+gossip+But+scandal+is+gossip+made+tedious+by+morality"&pg=PT52#v=onepage, Act III
Variant: Scandal is gossip made tedious by morality.
Source: Lady Windermere's Fan (1892)

“The only time people dislike gossip is when you gossip about them.”
As quoted in The New Speaker's Treasury of Wit and Wisdom (1958) by Herbert Victor Prochnow, p. 190
As quoted in ...
Variant: The only time people dislike gossip is when you gossip about them.