Book 10 says a person should balance the accounts of life the way a merchant balances a store ledger. The real question is not only whether a life looked active, but whether it ends in the black in the realm of heart.
That makes death diagnostic rather than merely tragic. If a person cannot welcome death, the chapter suggests it may be because the life was never ripened in love, devotion, and purpose deeply enough to feel complete.
This is a strong corrective to activity addiction. A packed life can still be spiritually insolvent if it never becomes rich in the only things that survive it.