“Time spent arguing with the faithful is, oddly enough, almost never wasted.”
Source: 2000s, 2001, Letters to a Young Contrarian (2001)
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Christopher Hitchens 305
British American author and journalist 1949–2011Related quotes

“Time spent with cats is never wasted.”
Frequently attributed to Freud, but there is no evidence Freud ever said it http://www.freud.org.uk/about/faq/.
Misattributed

“Never argue with a pedant over nomenclature. It wastes your time and annoys the pedant.”
Vorkosigan Saga, Memory (1996)

"Good And Bad Procrastination", December 2005

“All time is wasted that is not spent in seeking God.”
This adage is attributed to the ancient sage Sukdeva, as quoted in Promise of Immortality: The True Teaching of the Bible and the Bhagavad Gita (2001) by J. Donald Walters. p. 242
Disputed

“Waste no more time arguing what a good man should be. Be one.”
Μηκέθ᾽ ὅλως περὶ τοῦ οἷόν τινα εἶναι τὸν ἀγαθὸν ἄνδρα διαλέγεσθαι, ἀλλὰ εἶναι τοιοῦτον.
X, 16
Variant: Don't go on discussing what a good person should be. Just be one.
Source: Meditations (c. 121–180 AD), Book X