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Now inasmuch as virtue and hap- piness together constitute the possession of the summum bonum in a person, and the distribution of happiness in exact proportion to morality (which is the worth of the person, and his worthiness to be happy) constitutes the summum bonum of a possible world; hence this summum bonum expresses the whole, the perfect good, in which, however, virtue as the condition is always the supreme good,
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since it has no condition above it; whereas happiness, while it is pleasant to the possessor of it, is not of itself absolutely and in all           good, but always presupposes morally right behaviour as its condition.