Excellence (n.) is not an act, but a habit, because one is what one repeatedly does.
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Definition.com
Excellence (n.) is not an act but a habit.
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Excellence (n.) is an art won by training and habituation: we do not act rightly because we have virtue or excellence, but we rather have these because we have acted rightly.
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Excellence (n.) is best achieved via the middle way, the golden mean, the middle point between extremes and vices.
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Excellence (n.) is a completion: a thing lacking no part of the natural magnitude of its proper form.