bhoktṛtve 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.