Bhagavad Gita Chapter 6 Verse 12
भगवद् गीता अध्याय 6 श्लोक 12

तत्रैकाग्रं मनः कृत्वा यतचित्तेन्द्रियक्रियः।
उपविश्यासने युञ्ज्याद्योगमात्मविशुद्धये।।6.12।।



हिंदी अनुवाद - स्वामी रामसुख दास जी ( भगवद् गीता 6.12)
।।6.12।।उस आसनपर बैठकर चित्त और इन्द्रियोंकी क्रियाओंको वशमें रखते हुए मनको एकाग्र करके अन्तःकरणकी शुद्धिके लिये योगका अभ्यास करे।


Rudra Vaishnava Sampradaya - Commentary





The rule regarding the sitting place for meditation is being given  by  Lord
Krishna. The  word  sucau  means  clean  and  sanctified  and  that  is  the
conditions to begin. The reason why a deer  skin  or  tiger  skin  or  other
skins are used is because when one sits upon them poisonous  creatures  such
as scorpions and snakes do not like to wander upon such skins and thus  will
not bite when one is in meditative trance performing  yoga  or  the  science
of the  individual  consciousness  attaining  communion  with  the  ultimate
consciousness.


Brahma Vaishnava Sampradaya - Commentary





If one has not yet developed equanimity of mind then  one  should  undertake
the practice of meditation  given  previously  and  gradually  achieve  such
equanimity.


Shri Vaishnava Sampradaya - Commentary





Lord Krishna begins with the words  sucau  dese  means  pure  or  sanctified
place. Purity is to be found in nature  due  to  its  being  unoccupied  and
unfrequented by unclean and contaminated persons.  The  word  sthiram  means
firm infers the asana or seat should not be overly soft  neither  should  it
be so high that one may fall from it nor too low as in a  hole.  One  should
by all means have a mat of kusa grass which is sacred in Vishnu  tattva  and
then should be covered by a  deerskin  which  deters  poisonous  pests  like
snakes and scorpions from approaching one while in concentrated  meditation.
On top should be placed a wool or  cotton  cloth.  Such  a  seat  should  be
aesthetic to look at and inviting. Sitting upon such a seat one  should  one
should  withdraw  the  senses  and  freeing  the  mind  from  all   external
distractions one should focus the mind exclusively upon  the  atma  or  soul
within until upon its realisation one is freed from samsara or  the  endless
cycle of birth and death. By every means realise the atma.


Kumara Vaishnava Sampradaya - Commentary
Lord Krishna begins with the words  sucau  dese  means  pure  or  sanctified
place. Purity is to be found in nature  due  to  its  being  unoccupied  and
unfrequented by unclean and contaminated persons.  The  word  sthiram  means
firm infers the asana or seat should not be overly soft  neither  should  it
be so high that one may fall from it nor too low as in a  hole.  One  should
by all means have a mat of kusa grass which is sacred in Vishnu  tattva  and
then should be covered by a  deerskin  which  deters  poisonous  pests  like
snakes and scorpions from approaching one while in concentrated  meditation.
On top should be placed a wool or  cotton  cloth.  Such  a  seat  should  be
aesthetic to look at and inviting. Sitting upon such a seat one  should  one
should  withdraw  the  senses  and  freeing  the  mind  from  all   external
distractions one should focus the mind exclusively upon  the  atma  or  soul
within until upon its realisation one is freed from samsara or  the  endless
cycle of birth and death. By every means realise the atma.