Cc Ādi 3.21
Text
āpane nā kaile dharma śikhāna nā yāya
ei ta' siddhānta gītā-bhāgavate gāya
ei ta' siddhānta gītā-bhāgavate gāya
Synonyms
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.
Translation
"Unless one practices devotional service himself, he cannot teach it to others. This conclusion is indeed confirmed throughout the Gītā and Bhāgavatam.