Seneca's warning cuts deeper than the tired "seize the day" sentiment—he's identifying *postponement itself* as the thief, not mere inaction. The peculiar cruelty lies in the illusion of control: we delay believing we're simply being prudent or waiting for better circumstances, when in fact we're locked in a sprint against time's acceleration. A person who spends their thirties perfecting the résumé for the perfect job, perpetually "almost ready" to apply, discovers at forty that entire years have evaporated while they were preparing to live. Seneca suggests that delay doesn't preserve our options—it consumes them.