Truth-telling (n.) is never to be done to people who are not worthy of it.
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Truth-telling (n.) is advisable as a way to ensure that you need not remember what you had said.
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Truth-telling (n.) is always a matter of rhetoric. To tell the strict truth is the surest way to convey misinformation.
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Truth-telling (n.) saves one, when in doubt, from many a difficulty and many a disaster, and in times of tribulation and uncertainty comes to one's rescue.
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Truth-telling (n.) is, of the cardinal rules of business success, one of the most dangerous.