Chandogya-Upanisad (Chandogyopanisad) with commentary 7.20

निष्ठा गुरुशुश्रूषादिस्तत्परत्वं ब्रह्मविज्ञानाय ॥१॥

niṣṭhā guruśuśrūṣādistatparatvaṃ brahmavijñānāya //1//

Sanskrit only: no published translation is held for this verse.