Verse 51

संसङ्गेनान्तरस्थेन दह्यते प्रकृतिः स्वयम् ।स्वकलोत्थे नैरकाङ्क्षी पावकेन यथौषधिः

In plain words

By the attachment that dwells within, prakṛti is burned of itself -- just as a plant, desiring nothing, is burned by a fire sprung from its own parts.