“The proper mean.”
Le juste milieu.
Used in an address to the deputies of Gaillac. First occurs in a letter of Voltaire's to Count d'Argental (Nov. 29, 1765). Hoyt's New Cyclopedia Of Practical Quotations Also in Pascal—Pensées. (see Moderation)
Original
Le juste milieu.
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Louis Philippe I 3
King of the French 1773–1850Related quotes

“There is no proper meaning … every expression is essentially tropic.”
Cornelius Castoriadis, The Imaginary Institution of Society, trans. Kathleen Blamey (Cambridge, Mass. 1987) p. 348 ([10.1093/camqtly/bfs004]).

“Religion is by no means a proper subject of conversation in a mixed company.”
Letter to his godson, No.112 (undated)

On The Living Daylights, reported in Edward Gross, His Name was Bond, James Bond: Timothy Dalton on the World of 007 http://web.archive.org/20000304095759/www.geocities.com/Hollywood/Film/7518/Bond_Eng/Bond_Eng.htm.

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)

[199706251602.JAA01786@wall.org, 1997]
Usenet postings, 1997

Vol. 2, bk. 7, ch. 5
Enquiry Concerning Political Justice (1793)