Truth-telling (n.) is illicited by giving a man a mask. If you give a man a mask, he'll tell you the truth.
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Truth-telling (n.) is risky. If one tells the truth, one is sure - sooner or later - to be found out.
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Truth-telling (n.) is possible only if you make them laugh - otherwise they'll kill you.
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Truth-telling (n.) is a morbid and unhealthy faculty, developed by falling into careless habits of accuracy or frequenting the society of the aged and the well-informed.
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Truth-telling (n.) might just as well be done at once by a man sufficiently unimaginative to produce evidence in support of a lie.