Bhagavad Gita 2.68 — Mastery of the senses

तस्माद्यस्य महाबाहो निगृहीतानि सर्वशः। इन्द्रियाणीन्द्रियार्थेभ्यस्तस्य प्रज्ञा प्रतिष्ठिता ॥

tasmādyasya mahābāho nigṛhītāni sarvaśaḥ | indriyāṇīndriyārthebhyastasya prajñā pratiṣṭhitā ||

Meaning

So, mighty Arjuna, one whose senses are fully held back from their objects has steady wisdom.