One verse

Bhagavad Gita 8.12

8.12

सर्वद्वाराणि संयम्य मनो हृदि निरुध्य च | मूध्न्यार्धायात्मनः प्राणमास्थितो योगधारणाम् ||८-१२||

sarvadvārāṇi saṃyamya mano hṛdi nirudhya ca . mūdhnyā^^rdhāyātmanaḥ prāṇamāsthito yogadhāraṇām ||8-12||

sarva-dvārāṇi
all the doors of the body
saṁyamya
controlling
manaḥ
the mind
hṛdi
in the heart
nirudhya
confining
ca
also
mūrdhni
on the head
ādhāya
fixing
ātmanaḥ
of the soul
prāṇam
the life air
āsthitaḥ
situated in
yoga-dhāraṇām
the yogic situation
iti
thus

The yogic situation is that of detachment from all sensual engagements. Closing all the doors of the senses and fixing the mind on the heart and the life air at the top of the head, one establishes himself in yoga.