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Śrī Caitanya-caritāmṛta
[Antya-līlā, Ch. 4]
lokeṣu āvirbhūya tān anayāsēnaiva tat tad yuga-gata-mahā-sādhanānām sarvam eva phalaṁ dadānā sā kṛtārthayati. yata eva tayaiva kalau bhagavato viśeṣataś ca santoṣo bhavati.
“Chanting the holy name is the chief means of attaining love of Godhead. This chanting or devotional service does not depend on any paraphernalia, nor on one’s having taken birth in a good family. By humility and meekness one attracts the attention of Kṛṣṇa. That is the verdict of all the  Vedas . Therefore if one becomes very humble and meek, he can easily attain the lotus feet of Kṛṣṇa in this age of Kali. That is the fulfillment of all great sacrifices, penances and austerities because when one achieves ecstatic love of Godhead, he attains the complete perfection of life. Therefore whatever one does in executing devotional service must be accompanied with the chanting of the holy name of the Lord.” The chanting of the holy name of Kṛṣṇa—Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare—has been praised by Śrīla Rūpa Gosvāmī in his  Nāmāṣṭaka  (verse 1):
nikhila-śruti-mauli-ratna-mālā- dyuti-nīrājita-pāda-paṅkajānta ayi mukta-kulair upāsyamānaṁ paritas tvāṁ hari-nāma saṁśrayāmi
“O Hari-nāma! The tips of the toes of Your lotus feet are constantly being worshiped by the glowing radiance emanating from the string of gems known as the  Upaniṣads , the crown jewels of all the  Vedas . You are eternally adored by liberated souls such as Nārada and Śukadeva. O Hari-nāma! I take complete shelter of You.”
Similarly, Śrīla Sanātana Gosvāmī has praised the chanting of the holy name as follows in his  Bṛhad-bhāgavatāmṛta  (Chapter One, verse 9):
jayati jayati nāmānanda-rūpaṁ murārer viramita-nija-dharma-dhyāna-pūjādi-yatnam kathamapi sakṛd-āttaṁ muktidaṁ prāṇīnāṁ yat paramam amṛtam ekaṁ jīvanaṁ bhūṣaṇaṁ me
“All glories, all glories to the all-blissful holy name of Śrī Kṛṣṇa, which causes the devotee to give up all conventional religious duties, meditation and worship. When somehow or other uttered even once by a living entity, the holy name awards him liberation. The holy name of Kṛṣṇa is the highest nectar. It is my very life and my only treasure.”
In  Śrīmad-Bhāgavatam  (2.1.11) Śukadeva Gosvāmī says:
etan nirvidyamānānām icchatām akuto-bhayam yogināṁ nṛpa nirṇītaṁ harer nāmānukīrtanam