There is no cruelty so inexorable and unrelenting, as that which proceeds from a bigoted and presumptuous supposition of doing service to God. Under the influence of such hallucination, all common modes of reasoning are perverted, and all general principles are destroyed.
Charles Caleb "C. C." Colton (1780-1832) English cleric, writer, aphorist
Lacon: Or, Many Things in Few Words, Vol. 1, § 222 (1820)
(Source)