समस्तविद्यानामुपदेष्टृत्वात्, सर्वेषां जनकत्वाद्वा गुरुः ।विरिञ्च्यादीनामपि ब्रह्मविद्यासंप्रदायकत्वात् गुरुतमः, 'यो ब्रह्माणम्' इति मन्त्रवर्णात् ।धाम ज्योतिः, 'नारायणपरो ज्योतिः' इति मन्त्रवर्णात् ।सर्वकामाणामास्पदत्वाद्वा धाम, 'परमं ब्रह्म परं धाम' इति श्रुतेः ।सत्यवचनधर्मरूपत्वात् सत्यः, 'तस्मात्सत्यं परमं वदन्ति' इति श्रुतेः; सत्यस्य सत्यमिति वा, 'प्राणा वै सत्यं तेषामेव सत्यम्' इति श्रुतेः ।सत्यः अवितथः पराक्रमो यस्य सः सत्यपराक्रमः ।निर्मीलिते यतो नेत्रे योगनिद्रारतस्य अतो निमिषः ।नित्यप्रबुद्धस्वरूपत्वात् अनिमिषः; मत्स्यरूपतया वा आत्मरूपतया
In plain words
Because He is the instructor of all knowledge and the source of all beings, He is 'Guruḥ', the Teacher. Because He transmits the supreme science of Brahman even to Brahmā and others, He is 'Gurutamaḥ', the Supreme Preceptor, as affirmed by the Vedic verse, 'He who creates Brahmā...'. 'Dhāma' means light, as declared in the text, 'Nārāyaṇa is the supreme light'. Or it means abode, because He is the resting place of all desires, as the śruti says, 'The supreme Brahman, the supreme abode'. He is 'Satyaḥ', the True, because He embodies truthful conduct, as scripture states, 'Therefore they speak of the supreme truth'; or because He is the reality behind realities, as the text says, 'Prāṇas are indeed truth, and this is their truth'. He is 'Satyaparākramaḥ', one of unfailing prowess. Because His eyes are closed during cosmic slumber, He is 'Nimiṣaḥ', the Closer of Eyes; yet because His intrinsic nature is eternal awakening, He is also 'Animiṣaḥ', the Unblinking One—or perhaps on account of His form as the fish or as the pure Self.
Close to the Sanskrit
Because He is the preceptor of all branches of knowledge, or because He is the progenitor of all, Guruḥ (the preceptor). Because He imparts the knowledge of Brahman even to Brahmā and others, Gurutamaḥ (the most venerable teacher), according to the mantra 'He who Brahmā...'. Dhāma is light, based on the mantra 'Nārāyaṇa is the supreme light'. Or Dhāma because He is the receptacle of all desires, according to the śruti 'The supreme Brahman, the supreme abode'. Satyaḥ (the true) because of embodying truth-speaking duty, based on the śruti 'Therefore they speak of the supreme truth'; or as the truth of truth, based on the śruti 'Prāṇas are indeed truth, of them this is the truth'. Satyaḥ is one whose prowess is unfailing, thus Satyaparākramaḥ. Because His eyes are closed when engaged in yogic slumber, Nimiṣaḥ (the blinker). Because of His eternally awakened essence, Animiṣaḥ (the unblinking); or due to His form as a fish or as the Self.