The Katha Upanishad with Shankara’s Commentary
यस्तु विज्ञानवान्भवति युक्तेन मनसा सदा ।
तस्येन्द्रियाणि वश्यानि सदश्वा इव सारथेः ॥ ६ ॥
yastu vijñānavānbhavati yuktena manasā sadā |
tasyendriyāṇi vaśyāni sadaśvā iva sāratheḥ || 6 ||
6. But of him who knows and has a mind always controlled, the senses are always controllable as the good horses of the driver.
Com.—But of him who is a driver, the contrary of one already explained, i.e., of the driver who knows and who has the mind always under restraint, the senses standing in the place of the horses can be let go or stopped, i.e., controlled like the good horses of the other driver.