One verse

Srimad Bhagavatam 11.9.11

11.9.11

मन एकत्र संयुञ्ज्याज्जितश्वासो जितासन: । वैराग्याभ्यासयोगेन ध्रियमाणमतन्द्रित: ॥ ११ ॥

mana ekatra saṁyuñjyāj jita-śvāso jitāsanaḥ vairāgyābhyāsa-yogena dhriyamāṇam atandritaḥ

manaḥ
the mind
ekatra
in one place
saṁyuñjyāt
one should fix
jita
conquered
śvāsaḥ
the breathing process
jita
conquered
āsanaḥ
the yoga sitting postures
vairāgya
by detachment
abhyāsa-yogena
by the regulated practice of yoga
dhriyamāṇam
the mind being steadied
atandritaḥ
very carefully

Having perfected the yoga sitting postures and conquered the breathing process, one should make the mind steady by detachment and the regulated practice of yoga. Thus one should carefully fix the mind on the single goal of yoga practice.