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Ethical maxims are bandied about as a sort of current coin of discourse, and, being never melted down for use, those that are of base metal are never detected.

Richard Whately (1856). “Thoughts and Apophthegms: From the Writings of Archbishop Whateley”, p.158
Ethical maxims are bandied about as a sort of current coin of discourse, and, being never melted down for use, those that are of base metal are never detected.