Karika 57

vatsavivr̥ddhinimittaṁ kṣīrasya yathā pravr̥ttirajñasya। puruṣavimōkṣanimittaṁ tathā pravr̥ttiḥ pradhānasya ॥57॥

For the sake of nourishing the child milk flows without intelligence. Similarly, the pradhana, the unmanifest material cause, provides the instigation to act for the sake of liberation of the purusha.