Gradually, as the mind becomes progressively spiritualized, withdraw it from sense activities, and by intelligence the senses will be controlled. The mind too absorbed in material activities can be engaged in the service of the Personality of Godhead and become fixed in full transcendental consciousness.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
नियच्छेद्विषयेभ्योऽक्षान् मनसा बुद्धिसारथिः । मनः कर्मभिराक्षिप्तं शुभार्थे धारयेद्धिया
niyacchedviṣayebhyo'kṣān manasā buddhisārathiḥ | manaḥ karmabhirākṣiptaṃ śubhārthe dhārayeddhiyā
SB 2.1.18