|Ādi-līlā||Chapter 3: The External Reasons for the Appearance of Śrī Caitanya Mahāprabhu|
Bhaktivedanta VedaBase: Śrī Caitanya Caritāmṛta Ādi 3.21
āpane nā kaile dharma śikhāna nā yāya
ei ta' siddhānta gītā-bhāgavate gāya
āpane — personally; nā kaile — if not practiced; dharma — religion; śikhāna — the teaching; nā yāya — does not advance; ei — this; ta' — certainly; siddhānta — conclusion; gītā — in the Bhagavad-gītā; bhāgavate — in Śrīmad-Bhāgavatam; gāya — they sing.
"Unless one practices devotional service himself, he cannot teach it to others. This conclusion is indeed confirmed throughout the Gītā and Bhāgavatam.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness