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कार्यकारणकर्तृत्वे हेतुः प्रकृतिरुच्यते ।
पुरुषः सुखदुःखानां भोक्तृत्वे हेतुरुच्यते ॥ २१ ॥

karya-karana-kartrtve

hetuh prakrtir ucyate

purusah sukha-duhkhanam

bhoktrtve hetur ucyate

karya-effect; karana-cause; kartrtve-in the matter of creation; hetuh-instrument; prakrtih-material nature; ucyate-is said to be; purusah-the living entities; sukha-happiness; duhkhanam-of distresses; bhoktrtve-in enjoyment; hetuh-instrument; ucyate-is said to be.