The Yoga of Knowledge

Krishna reveals the mechanism from verse 2.66—how wisdom gets lost. Your senses naturally roam (indriyāṇāṁ caratām)—eyes scanning, ears seeking. The problem isn't this; it's when your mind becomes subordinate (mano 'nuvidhīyate) and follows them helplessly. This should be reversed: mind directs senses. But when mind follows instead, wisdom gets stolen (harati prajñām)—like wind blowing a boat on water (vāyur nāvam iva). A boat needs a helmsman steering; here it's blown helplessly. Similarly, your prajñā (discriminative wisdom) gets carried away when mind chases every sense impression.