“Use a sweet tongue, courtesy, and gentleness, and thou mayst manage to guide an elephant with a hair.”
Chapter 3, story 28 http://books.google.com/books?id=LDpbAAAAQAAJ&q=%22use+a+sweet+tongue+courtesy+and+gentleness+and+thou+mayst+manage+to+guide+an+elephant+with+a+hair%22&pg=PA292#v=onepage
Gulistan (1258)
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Saadi 5
Persian poet 1210–1291Related quotes

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 369.

“Hail, ye small, sweet courtesies of life! for smooth do ye make the road of it.”
The Pulse, Paris.
A Sentimental Journey Through France and Italy (1768)
"A Quarrel with some Old Acquaintances".
Sketches from Life (1846)

Source: The Analects, Other chapters
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 323.

“He rolls it under his tongue as a sweet morsel.”
Psalm 36.
Commentaries

“The voice was gentle, like a scalpel petting the short hairs of your throat.”
Source: A Fire Upon the Deep (1992), Chapter 5 (p. 51).

“On the tongue of such an one they shed a honeyed dew, and from his lips drop gentle words.”
Source: The Theogony (c. 700 BC), line 82.