2:61  

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

taani sarwaaNi saMyamya yukta aasiita matparaH ।

washe hi yasyendriyaaNi tasya pradnyaa pratiShThitaa ॥२- ६१॥

Source: Automatic ITRANS Transliteration

Restraining all of them, the adherent, staying devoted to Me,
These senses in control — that one's insight is stabilized.

Source: Milind S. Pandit

Having brought the senses under control, one should fix one's mind on the Self. One's Prajna becomes steady whose senses are under control.

Source: The Bhagavad-Gita: The Sacred Song

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

Source: Bhagavad Gita As It Is