Jñāneśvarī (commentary on the Bhagavadgītā) 2.314

2.314

tiye saṃdḥīṃ mana jāye |
maga abhyāsīṃ ṭhoṭāvaleṃ ṭhāye |
aiseṃ baḷakaṭapaṇa āhe |
iṃdriyāṃce ||

At that opportunity, the mind wanders off, / and then the practice remains paralyzed; / such is the stubborn strength / of the senses.