Bhagwad Gita
Chapter 13, Verse 21
कार्यकारणकर्तृत्वे हेतुः प्रकृतिरुच्यते।पुरुषः सुखदुःखानां भोक्तृत्वे हेतुरुच्यते।।13.21।।
Nature is said to be the cause of all material activities and effects, whereas the living entity is the cause of the various sufferings and enjoyments in this world.