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Mother Teresa : essential > non-essential Churchill's typist: non-essential ? essential? realize blunt nature of this portrayal is unfair but is this correct comp? Churchill's typist played some key role to him while Mother Teresa served as a key symbol to others.
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Can you be only useful to the useless? Are there uses useless people need that useful people don't? Wouldn't you just be useful in general?
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terms like ‘useful’ and ‘useless’ have an implied context. If you are useful to the ‘useless’, then in the context of the ‘useless’ you are useful. But then your question implies a unspecified, to be chosen by the reader, change in context.
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"If you're only useful to the useless, are you useful?" Yes. In fact, that's the only way to be useful. If you're only useful for other useful people, that's a vicious circle.