Chapter 2 · The Yoga of Knowledge · Krishna said
Bhagavad Gita 2.60 — The pull of the senses
यततो ह्यपि कौन्तेय पुरुषस्य विपश्चितः। इन्द्रियाणि प्रमाथीनि हरन्ति प्रसभं मनः ॥
yatato hyapi kaunteya puruṣasya vipaścitaḥ | indriyāṇi pramāthīni haranti prasabhaṃ manaḥ ||
Meaning
Arjuna, the restless senses can forcibly carry away the mind even of a wise person who is striving.