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When you have made a catalogue of your friend's faults it is only fair to supply him with a duplicate, so that he may know yours.

Ambrose Bierce (2013). “Delphi Complete Works of Ambrose Bierce (Illustrated)”, p.2690, Delphi Classics
When you have made a catalogue of your friend's faults it is only fair to supply him with a duplicate, so that he may know yours.