nanv artha-kovidā brahman varṇāśrama-vatām iha
nanv artha-kovidā brahman varṇāśrama-vatām iha |
ye mayā guruṇā vācā taranty añjo bhavārṇavam ||
(Śrīmad Bhāgavatam: 10.80.33)
“[Kṛṣṇa to Sudāmā:] O brāhmaṇa, certainly they among those adherent to varṇa and āśrama here are sagacious who easily cross over the ocean of material existence by means of words from me—the guru.”