Karika 57

वत्सविवृद्धिनिमित्तं क्षीरस्य यथा प्रवृत्तिरज्ञस्य। पुरुषविमोक्षनिमित्तं तथा प्रवृत्तिः प्रधानस्य ॥५७॥

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

[वत्स विवृद्धि निमित्तं क्षीरस्य यथा प्रवृत्तिः अज्ञस्य। पुरुष विमोक्ष निमित्तं तथा प्रवृत्तिः प्रधानस्य॥
vatsa = child; vivr̥ddhi = nourishment; nimittaṁ = for the sake of; kṣīrasya = milk exists; yathā = in the same way; pravr̥ttiḥ = tendencies to act; ajñasya = without intelligence; puruṣa = purusha; vimōkṣa = liberation; nimittaṁ = for the sake of; tathā = therefore; pravr̥ttiḥ = the instigation to act; pradhānasya = is of pradhan i.e prakruti in un-manifest form;]

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.