"So it is—the life we receive is not short, but we make it so, nor do we have any lack of it, but are wasteful of it. Just as great and princely wealth is scattered in a moment when it comes into the hands of a bad owner, while wealth however limited, if it is entrusted to a good guardian, increases by use, so our life is amply long for him who orders it properly." -Seneca, "On the Shortness of Life"
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The book format also makes for a great gift option to family, friends, etc.: On the Shortness of Life