“Nothing is so fatal to religion as indifference.”
Letter to William Smith, Member of the Irish Parliament (29 January 1795), quoted in R. B. McDowell (ed.), The Correspondence of Edmund Burke, Volume VIII: September 1794–April 1796 (Cambridge University Press, 1969), p. 128
/ 1790s
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Edmund Burke 270
Anglo-Irish statesman 1729–1797Related quotes

“Nothing is so offensive to Christ as lukewarmness in religion.”
Vol. II, Luke XI: 21–26, p. 25
Expository Thoughts on the Gospels: St. Luke (1858–1859)

“Nothing is more fatal to happiness than the remembrance of happiness.”
Source: The Immoralist

As quoted in Humphry Davy : Science & Power (1998) by David Knight, p. 87

“Moderation is a fatal thing, Lady Hunstanton. Nothing succeeds like excess.”
Lord Illingworth, Act III
A Woman of No Importance (1893)

“In the spiritual realm nothing is indifferent: what is not useful is harmful.”
Source: A Letter to a Hindu (1908), VII
In 1647, as quoted in "Free Speech and Its Present Crisis" https://www.city-journal.org/free-speech-crisis (2018), by Allen C. Guelzo, City Journal

Ten Years' Exile (Dix années d'exil, written 1810–1813, posthumously published 1821), ch. 16

US News & World Report (27 October 1986)