Bhagavad Gita: Chapter 2, Verse 60

यततो ह्यपि कौन्तेय पुरुषस्य विपश्चितः ।
इन्द्रियाणि प्रमाथीनि हरन्ति प्रसभं मनः ॥ २-६० ॥

yatato hy api kaunteya puruṣasya vipaścitaḥ
indriyāṇi pramāthīni haranti prasabhaṁ manaḥ 2.60

The senses are so strong and turbulent, O son of Kunti, that they forcibly carry away the mind even of a person of discrimination who is endeavoring to control them.