SB 10.52.20

brahman kṛṣṇa-kathāḥ puṇyā
 mādhvīr loka-malāpahāḥ
ko nu tṛpyeta śṛṇvānaḥ
 śruta-jño nitya-nūtanāḥ
Word for word: 
brahman — O brāhmaṇa; kṛṣṇa-kathāḥ — topics of Kṛṣṇa; puṇyāḥ — pious; mādhvīḥ — sweet; loka — of the world; mala — the contamination; apahāḥ — which remove; kaḥ — who; nu — at all; tṛpyeta — would become satiated; śṛṇvānaḥ — hearing; śruta — what is heard; jñaḥ — who can understand; nitya — always; nūtanāḥ — novel.
Translation: 
What experienced listener, O brāhmaṇa, could ever grow satiated while listening to the pious, charming and ever-fresh topics of Lord Kṛṣṇa, which cleanse away the world’s contamination?