Bhagavad-gītā 13.21
BG 13.21
Open the full passageकार्यकारणकर्तृत्वे हेतुः प्रकृतिरुच्यते । पुरुषः सुखदुःखानां भोक्तृत्वे हेतुरुच्यते ॥२१॥
Sanskrit
kārya-kāraṇa-kartṛtve hetuḥ prakṛtir ucyate puruṣaḥ sukha-duḥkhānāṁ bhoktṛtve hetur ucyate
Translation
Nature is said to be the cause of all material causes and effects, whereas the living entity is the cause of the various sufferings and enjoyments in this world.