Shiva Purana
कारणं त्वात्मभोगार्थं जीवकर्मानुरूपतः । सुखं दुःखं पुण्यपापैः कर्मभिः फलमश्नुते ७ ।
The causal body is for the sake of experiencing the good and bad results of the activities of the Jiva. The Jīva experiences happiness as a result of virtue and misery as a result of sin.
english translation
kAraNaM tvAtmabhogArthaM jIvakarmAnurUpataH । sukhaM duHkhaM puNyapApaiH karmabhiH phalamaznute 7 ।
hk transliteration by Sanscript