Verse 25

स्थूलतामेति पाकेन मनो बिल्वफलं यथा ।मूषास्थद्रुतहेमाभं स्फुरितं विमलाम्बरे

In plain words

mind attains grossness through ripening, as a bilva fruit does. Flashing in the stainless sky, gleaming like molten gold in a crucible,