The Āyurveda-śāstra recommends,
auṣadhi cintayet viṣṇum :
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even while taking medicine, one should remember Viṣṇu,
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because the medicine is not all and all and Lord Viṣṇu is the real protector.
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The material world is full of danger (padaṁ padaṁ yad vipadām). Therefore one must become a Vaiṣṇava and think of Viṣṇu constantly.
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This is made easier by the chanting of the Hare Kṛṣṇa mahā-mantra.
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Therefore Śrī Caitanya Mahāprabhu has recommended, kīrtanīyaḥ sadā hariḥ paraṁ vijayate śrī-kṛṣṇa-saṅkīrtanam, and kīrtanād eva kṛṣṇasya mukta-saṅgaḥ paraṁ vrajet.
Excerpt from HDG A. C. Bhaktivedanta Swami Śrīla Prabhupāda’s purport to SB 10.6.27-29