कार्यकारणकर्तृत्वे हेतुः प्रकृतिरुच्यते।
पुरुषः सुखदुःखानां भोक्तृत्वे हेतुरुच्यते।।13.21।।
13.21 With regard to the source of body and organs, Nature is said to be the cause. The soul is the cause so far as enjoyership of happiness and sorrow is concerned.
13.21 In the production of the effect and the cause, Nature (matter) is said to be the cause; in the experience of pleasure and pain, the soul is said to be the cause.
13.21. In creating [the process of] cause-and-effect, the Material Cause is said to be the basis; and in experiencing pleasure and pain, the Soul is said to be the basis.
Kaaryakaaranakartrutwe hetuh prakritiruchyate; Purushah sukhaduhkhaanaam bhoktritwe heturuchyate.
kārya—effect; kāraṇa—cause; kartṛitve—in the matter of creation; hetuḥ—the medium; prakṛitiḥ—the material energy; uchyate—is said to be; puruṣhaḥ—the individual soul; sukha-duḥkhānām—of happiness and distress; bhoktṛitve—in experiencing; hetuḥ—is responsible; uchyate—is said to be