“Religion is by no means a proper subject of conversation in a mixed company.”
Letter to his godson, No.112 (undated)
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Philip Stanhope, 4th Earl of Chesterfield 65
British statesman and man of letters 1694–1773Related quotes

“The smaller the company, the larger the conversation.”
Source: Aphorisms and Reflections (1901), p. 182

Original manuscript at The Library of Congress Letter http://lcweb.loc.gov/exhibits/religion/vc006646.jpg to Thomas Jefferson (19 April 1817). The italicized section within this statement has often been quoted out of context. Earlier in the letter Adams explained "Lemuel Bryant was my Parish Priest; and Joseph Cleverly my Latin School Master. Lemuel was a jolly jocular and liberal schollar and Divine. Joseph a Schollar and a Gentleman; but a biggoted episcopalian... The Parson and the Pedagogue lived much together, but were eternally disputing about Government and Religion".
1810s
Context: Twenty times in the course of my late reading have I been on the point of breaking out, "This would be the best of all possible worlds, if there were no religion in it!!!" But in this exclamation I would have been as fanatical as Bryant or Cleverly. Without religion this world would be something not fit to be mentioned in polite company, I mean Hell.

“Any idealism is a proper subject for art.”
Source: Out of the East, Books and Habits, p. 22.

This was the method followed by Euclid, who, fortunately for us, never dreamed of a geometry of triangles, as distinguished from a geometry of circles, or a separate application of the arithmetics of addition and subtraction; but made one help out the other as he best could.
The Differential and Integral Calculus (1836)

“Other people’s tragedies should not be the subject of idle conversation.”
Source: Because of Winn-Dixie