“The oldest and best known evil was ever more supportable than one that was new and untried.”
Book III, Ch. 9. Of Vanity
Essais (1595), Bartlett's Familiar Quotations, 10th ed. (1919)
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Michel De Montaigne 264
(1533-1592) French-Occitan author, humanistic philosopher, … 1533–1592Related quotes

“The best known evil is the most tolerable.”
Notissimum [...] malum maxime tolerabile
Book XXIII, sec. 3
History of Rome
Variant: Those ills are easiest to bear with which we are most familiar.

“I seek new perfumes, ampler blossoms, untried pleasures.”
Source: Against Nature

As quoted in White Coat Tales : Medicine's Heroes, Heritage and Misadventures (2007) by Robert B. Taylor, p. 141. The original Source is the last sentence of https://www.nobelprize.org/nobel_prizes/physics/laureates/1903/pierre-curie-lecture.pdf
Misattributed

Would President Assad invite a cruise missile to his palace? http://www.robert-fisk.com/articles230.htm, 15 April, 2003
2003
A Footnote To Rally The Academic, p. 179.
In Defence Of Politics (Second Edition) – 1981

#106, Part 2
Twenty Seven Thousand Aspiration Plants Part 1-270 (1983)