Hiram Johnson is often credited with this statement, or something similar. However, Snowden's use appears to have predated those of Johnson while being more consistent with the now-common, "Truth is the first casualty of war."
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False words are not only evil in themselves, but they infect the soul with evil.
Wars produce many stories of fiction, some of which are told until they are believed to be true.
Attribution
Quote text and notes from Wikiquote: Philip Snowden, 1st Viscount Snowden (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.