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1 1.7.15. The argument for friendship from the definition of happiness as virtuous and therefore pleasant activity is threefold: （ α） the virtuous actions of our friends give us （by sympathy） the same pleasure as our own; （ β） good activities （e.g. study） can be carried on longer （because less liable to fatigue） ; （ γ） virtuous friends increase our own virtue （as we unconsciously imitate their acts）. Hence friends useful and pleasant because virtuous （though not useful or pleasant friends in the ordinary sense） are necessary adjuncts of happiness.
3 i.e., they are good, and they are their own, i.e. like their own.