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na kutascid bhayam tasya
vidyam dharayato bhavet
vyadhy-adibhyas ca karhicit
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
This prayer, Narayana-kavaca, constitutes subtle knowledge transcendentally connected with Narayana. One who employs this prayer is never disturbed or put in danger by the government, by plunderers, by evil demons or by any type of disease.