Karika 56

इत्येषः प्रकृतिकृतो महदादिविशेषभूतपर्यन्तः। प्रतिपुरुषविमोक्षार्थं स्वार्थैव परार्थारम्भः ॥५६॥

Thus, the prakriti, the material cause, creates mahat, the ego, and other special elements for the sake of liberation of each purusha. Though it appears to start because of self-interest, it is for the sake of others.