I don't think you can go far wrong with the advice in this couplet:
Quote:
All that is gold does not glitter,
Not all those who wander are lost;
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However my favourite phrase is one that isn't really advice, more of a heavily veiled compliment, and one I've still to find an occasion to use despite it coming to mind most days:
Quote:
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I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve.
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