Chapter 6 · verse 25 · gita.yoga.org

Bhagavad Gita 6.25

शनैः शनैरुपरमेद् बुद्ध्या धृतिगृहीतया। आत्मसंस्थं मनः कृत्वा न किञ्चिदपि चिन्तयेत्

Little by little, let him attain steadiness of the intellect by holding it firmly; having made the mind establish itself in the Self, let him not think of anything else.