CC Madhya 22.107
- nitya-siddha kṛṣṇa-prema 'sādhya' kabhu naya
- śravaṇādi-śuddha-citte karaye udaya
nitya-siddha—eternally established; kṛṣṇa-prema—love of Kṛṣṇa; sādhya—to be gained; kabhu—at any time; naya—not; śravaṇa-ādi—by hearing, etc.; śuddha—purified; citte—in the heart; karaye udaya—awakens.
"Pure love for Kṛṣṇa is eternally established in the hearts of the living entities. It is not something to be gained from another source. When the heart is purified by hearing and chanting, this love naturally awakens.