Śrī Caitanya-caritāmṛta - Ādi-līlā 7.141-142

"“It is only by devotional service, beginning with hearing, that one can approach the Supreme Personality of Godhead. That is the only means to approach Him."

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"“By practicing this regulated devotional service under the direction of the spiritual master, certainly one awakens his dormant love of Godhead. This process is called abhidheya."

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Śrī caitanya-caritāmṛta Ādi 7.141 & 142