Nārāyaṇa-kavaca — The Armor of Lord Nārāyaṇa
यथा हि भगवानेव वस्तुत: सदसच्च यत् । सत्येनानेन न: सर्वे यान्तु नाशमुपद्रवा: ॥ ३१ ॥
yathā hi bhagavān eva vastutaḥ sad asac ca yat satyenānena naḥ sarve yāntu nāśam upadravāḥ
The subtle and gross cosmic manifestation is material, but nevertheless it is nondifferent from the Supreme Personality of Godhead because He is ultimately the cause of all causes. Cause and effect are factually one because the cause is present in the effect. Therefore the Absolute Truth, the Supreme Personality of Godhead, can destroy all our dangers by any of His potent parts.
This verse states that Bhagavan alone is the ultimate reality and that He encompasses both the manifest (sat) and the unmanifest or seemingly non-existent (asat), indicating His all-pervading supremacy beyond dualities.
While reciting the Narayana-kavaca for divine protection, Indra invokes a ‘satyavacana’—a truth-statement—affirming the Lord’s absolute nature and requesting that, by that truth, all dangers and obstacles be neutralized.
Remembering that the Supreme Lord governs both seen and unseen circumstances helps a devotee face uncertainty with faith; one can pray with sincerity for protection and steadiness, especially during crises and anxiety.