Karika 56

ityēṣaḥ prakr̥tikr̥tō mahadādiviśēṣabhūtaparyantaḥ। pratipuruṣavimōkṣārthaṁ svārthaiva parārthārambhaḥ ॥56॥

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.