Sbg 13.21 ecsiva
English Commentary By Swami Sivananda 13.21 कार्यकारणकर्तृत्वे in the production of the effect, and the cause, हेतुः the cause, प्रकृतिः Prakriti, उच्यते is said (to be), पुरुषः Purusha, सुखदुःखानाम् of pleasure and pain, भोक्तृत्वे in the experience, हेतुः the cause, उच्यते is said (to be).