Prakriti is the source of the workings of cases and effects. Prakriti is the source of the capacity of enjoying pleasures and pains.
कार्यकरणकर्तृत्वे हेतुः प्रकृतिरुच्यते। पुरुषः सुखदुःखानां भोक्तृत्वे हेतुरुच्यते॥