Śrī Caitanya-caritāmṛta - Ādi-līlā 17.21-22

"“ ‘In this Age of Kali there is no other means, no other means, no other means for self-realization than chanting the holy name, chanting the holy name, chanting the holy name of Lord Hari.’"

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"“In this Age of Kali, the holy name of the Lord, the Hare Kṛṣṇa mahā-mantra, is the incarnation of Lord Kṛṣṇa. Simply by chanting the holy name, one associates with the Lord directly. Anyone who does this is certainly delivered."

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Śrī caitanya-caritāmṛta Ādi 17.21 & 22