One verse

Bhagavad Gita 6.12

6.12

तत्रैकाग्रं मनः कृत्वा यतचित्तेन्द्रियक्रियः | उपविश्यासने युञ्ज्याद्योगमात्मविशुद्धये ||६-१२||

tatraikāgraṃ manaḥ kṛtvā yatacittendriyakriyaḥ . upaviśyāsane yuñjyādyogamātmaviśuddhaye ||6-12||

tatra
thereupon
eka-agram
with one attention
manaḥ
mind
kṛtvā
making
yata-citta
controlling the mind
indriya
senses
kriyaḥ
and activities
upaviśya
sitting
āsane
on the seat
yuñjyāt
should execute
yogam
yoga practice
ātma
the heart
viśuddhaye
for clarifying

To practice yoga, one should go to a secluded place and should lay kuśa grass on the ground and then cover it with a deerskin and a soft cloth. The seat should be neither too high nor too low and should be situated in a sacred place. The yogī should then sit on it very firmly and practice yoga to purify the heart by controlling his mind, senses and activities and fixing the mind on one point.