Bhagavad Gita Chapter 13 Verse 20
भगवद् गीता अध्याय 13 श्लोक 20

प्रकृतिं पुरुषं चैव विद्ध्यनादी उभावपि।
विकारांश्च गुणांश्चैव विद्धि प्रकृतिसंभवान्।।13.20।।



हिंदी अनुवाद - स्वामी रामसुख दास जी ( भगवद् गीता 13.20)
।।13.20।।प्रकृति और पुरुष -- दोनोंको ही तुम अनादि समझो और विकारों तथा गुणोंको भी प्रकृतिसे ही उत्पन्न समझो। कार्य और करणके द्वारा होनेवाली क्रियाओंको उत्पन्न करनेमें प्रकृति हेतु कही जाती है और सुखदुःखोंके भोक्तापनमें पुरुष हेतु कहा जाता है।


Shri Vaishnava Sampradaya - Commentary





Here Lord Krishna explains that from the beginning of  time  purusa  or  the
immortal soul  and  prakriti  the  material  substratum  pervading  physical
existence have been  existing  united  together.  The  word  vikarams  means
modifications  and  transformations  this  denotes  non-spiritual   material
attributes and passions. The word gunas or three modes  of  material  nature
being sattva or goodness  with  its  virtues,  rajas  or  passion  with  its
desires and tamas or nescience with its ignorance are  all  by  products  of
prakriti. Virtuous qualities such as reverence and humility are situated  in
sattva and effectuate moksa  or  liberation  from  material  existence.  The
qualities of passion with their desires  and  attachments  are  situated  in
rajas and effectuates  bondage  to  material  existence.  The  qualities  of
ignorance with sense gratification as the goal of existence is  situated  in
tamas and effectuates degeneration into  less  evolved  species  next  life.
Purusa uniting with prakriti has been perpetuating since  the  beginning  of
time and expresses itself as a ksetra  or  field  of  activity  which  is  a
physical body. The jiva or embodied being influenced  by  the  modifications
of rajas and tamas in the form of  desire  and  attachment,  attraction  and
aversion, shrouds the atma  or  immortal  soul  and  keeps  it  in  bondage.
Contrarily the jiva being influenced by the modifications of sattva  in  the
form of the 20 super excellent attributes of spiritual  endowment  given  in
verses 8 to 12 headed by reverence and humility  constitutes  the  cause  of
the atma attaining moksa.