“Be courteous to all, but intimate with few, and let those few be well tried before you give them your confidence. True friendship is a plant of slow growth, and must undergo & withstand the shocks of adversity before it is entitled to the appellation.”
George Washington to his nephew (Pushrod Washington)
The Incisal Edge 
My Nan said to me when I was off to boarding-school at the age of 11: be friendly with everyone but friends with no-one.
Have a good day, Alun
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Clearly a wise lady. All the best. Alun
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