"Perhaps the mere existence of things undone should be a sort of satisfaction in itself, though the idea would appear to be paradoxical. Only one who is long since dead while still seemingly alive does not have many "promises to keep, and miles to go before I sleep," and that state of inertness is not to be desired. To the wise advice that we live every day as though it will be our last, we do well to add the admonition to live every day as though we will be on this earth forever."