|Madhya-līlā||Chapter 22: The Process of Devotional Service|
Bhaktivedanta VedaBase: Śrī Caitanya Caritāmṛta Madhya 22.156-157
bāhya, antara, — ihāra dui ta' sādhana
'bāhye' sādhaka-dehe kare śravaṇa-kīrtana
'mane' nija-siddha-deha kariyā bhāvana
rātri-dine kare vraje kṛṣṇera sevana
bāhya — externally; antara — internally; ihāra — of this spontaneous love of Godhead; dui — two; ta' — indeed; sādhana — such processes of execution; bāhye — externally; sādhaka-dehe — with the body of an advanced devotee; kare — does; śravaṇa-kīrtana — hearing and chanting; mane — the mind; nija — own; siddha-deha — eternal body or self-realized position; kariyā bhāvana — thinking of; rātri-dine — night and day; kare — executes; vraje — in Vṛndāvana; kṛṣṇera — of Lord Kṛṣṇa; sevana — service.
"There are two processes by which one may execute this rāgānugā bhakti — external and internal. When self-realized, the advanced devotee externally remains like a neophyte and executes all the śāstric injunctions, especially those concerning hearing and chanting. But within his mind, in his original, purified, self-realized position, he serves Kṛṣṇa in Vṛndāvana in his particular way. He serves Kṛṣṇa twenty-four hours a day, all day and night.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness