Mahabharata 12.204.12
हेतुयुक्ताः प्रकृतयो विकाराश्च परस्परम्अन्योन्यमभिवर्तन्ते पुरुषाधिष्ठिताः सदा
hetuyuktāḥ prakṛtayo vikārāśca parasparamanyonyamabhivartante puruṣādhiṣṭhitāḥ sadā
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book