kāraṇam

आरुरुक्षोर्मुनेर्योगं कर्म कारणमुच्यते

kāraṇam — the cause

For the sage climbing toward yoga, action is said to be the means. For one already established in it, stillness is.

कार्यकारणकर्तृत्वे हेतुः प्रकृतिरुच्यते

kārya — effect

Nature is said to be the ground of cause and effect and of doing; the person is said to be the ground of the experience of pleasure and pain.

पुरुषः प्रकृतिस्थो हि भुङ्क्ते प्रकृतिजान्गुणान्

kāraṇam — the cause

The person, seated in nature, experiences the strands born of nature. Attachment to those strands is the cause of birth in good wombs and bad.