Bhagavad Gita · 2.60

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

yatato hy api kaunteya puruṣhasya vipaśhchitaḥ indriyāṇi pramāthīni haranti prasabhaṁ manaḥ

O son of Kunti, the turbulent senses forcibly carry away the mind of even a wise person who is striving for perfection.

— Bhagavad Gita 2.60

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)