Bhagavad Gita 13.21
Nature is the law that generates cause and effect; God is the source of all pleasure and pain.
कार्यकारणकर्तृत्वे हेतुः प्रकृतिरुच्यते।पुरुषः सुखदुःखानां भोक्तृत्वे हेतुरुच्यते॥kāryakāraṇakartṛtve hetuḥ prakṛtirucyate|puruṣaḥ sukhaduḥkhānāṃ bhoktṛtve heturucyate||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).