Jñāneśvarī (commentary on the Bhagavadgītā) 2.310

2.310

yatato hy api kaunteya puruṣasya vipaścitaḥ
indriyāṇi pramāthīni haranti prasabhaṃ manaḥ
yeravhī tarī arjunā |
heṃ āyā naye sādhanā |
je rāhaṭatātī jatanā |
niraṃtara ||

Otherwise, O Arjuna, / this cannot be mastered through effort, / even by those who constantly / engage in striving,