'gaura-gopāla mantra' tomāra cāri akṣara
aviśvāsa chāḍa, yei kariyācha antara"
gaura-gopāla mantra - the Gaura-gopāla mantra; tomāra - your; cāri akṣara - composed of four syllables; aviśvāsa chāḍa - give up your doubts; yei - which; kariyācha antara - you have kept within your mind.
Śrīla Bhaktivinoda Ṭhākura explains the Gaura-gopāla mantra in his Amṛta-pravāha-bhāṣya. Worshipers of Śrī Gaurasundara accept the four syllables gau-ra-aṅ-ga as the Gaura mantra, but pure worshipers of Rādhā and Kṛṣṇa accept the four syllables rā-dhā kṛṣ-ṇa as the Gaura-gopāla mantra. However, Vaiṣṇavas consider Śrī Caitanya Mahāprabhu nondifferent from Rādhā-Kṛṣṇa (śrī-kṛṣṇa-caitanya rādhā-kṛṣṇa nahe anya). Therefore one who chants the mantra “gaurāṅga” and one who chants the names of Rādhā and Kṛṣṇa are on the same level.