Bhagavad Gita 2.68

तस्माद्यस्य महाबाहो निगृहीतानि सर्वशः।इन्द्रियाणीन्द्रियार्थेभ्यस्तस्य प्रज्ञा प्रतिष्ठिता॥

tasmādyasya mahābāho nigṛhītāni sarvaśaḥ |indriyāṇīndriyārthebhyastasya prajñā pratiṣṭhitā ||

Therefore, O mighty-armed Arjuna, his knowledge is steady whose senses are completely restrained from sense objects.

Therefore, O Mighty-Armed One, he whose senses are detached from their objects—take it that his reason is purified.

Our plain-language meaning of this verse is waiting for scholar review.