Bhagavad Gita: Chapter 2, Verse 61

तानि सर्वाणि संयम्य युक्त आसीत मत्परः ।
वशे हि यस्येन्द्रियाणि तस्य प्रज्ञा प्रतिष्ठिता ॥ २-६१ ॥

tāni sarvāṇi saṁyamya yukta āsīta mat-paraḥ
vaśe hi yasyendriyāṇi tasya prajñā pratiṣṭhitā 2.61

One who restrains his senses, keeping them under full control, and fixes his consciousness upon Me, is known as a man of steady intelligence.