No independent bhāṣya is recorded for this śloka in the source text. The verse appears as a cited quotation. Summary of the verse's teaching: Śloka 5 is a rhetorical climax to the opening sequence. Where śloka 4 called the negligent person a self-slayer, śloka 5 goes further: there is simply no greater fool in the world (iha ko nu asti mūḍhātmā) than one who is heedless of svārtha — which here means not worldly self-interest but the supreme spiritual goal, liberation. The word pauruṣa carries a double sense: manliness (the rare masculine human capacity for Vedic study and sannyāsa praised in ślokas 2–4) and vigorous effort. Both senses reinforce the exhortation: given such a rare and potent instrument, negligence is nothing short of stupidity of the highest order.