Bhagavad Gita 6.25

शनैः शनैरुपरमेद् बुद्ध्या धृतिगृहीतया।आत्मसंस्थं मनः कृत्वा न किञ्चिदपि चिन्तयेत्॥

śanaiḥ śanairuparamed buddhyā dhṛtigṛhītayā |ātmasaṃsthaṃ manaḥ kṛtvā na kiñcidapi cintayet ||

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.

Little by little, with the help of his reason controlled by fortitude, let him attain peace; and, fixing his mind on the Self, let him not think of anything else.

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