Śukadeva Gosvāmī answered: One should control the sitting posture, regulate the breathing process by the yogic prāṇāyāma and thus control the mind and senses and with intelligence apply the mind to the gross potencies of the Lord [called the virāṭ-rūpa].
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
श्रीशुक उवाच । जितासनो जितश्वासो जितसङ्गो जितेन्द्रियः । स्थूले भगवतो रूपे मनः सन्धारयेद्धिया
śrīśuka uvāca | jitāsano jitaśvāso jitasaṅgo jitendriyaḥ | sthūle bhagavato rūpe manaḥ sandhārayeddhiyā
SB 2.1.23