This has often been published as a quotation of Russell, when an author is given (e.g. in Quote Unquote – A HandBook of Quotation, 2005, p. 291), but without any sourced citations, and seems to have circulated as an anonymous proverb as early as 1932.
More quotes by Bertrand Russell
Often and often, a marriage hardly differs from prostitution except by being harder to escape from.
My whole religion is this: do every duty, and expect no reward for it, either here or hereafter.
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Quote text and notes from Wikiquote: Bertrand Russell (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.