Verse 16

मूलान्यपि सुसूक्ष्माणि कठिनाशयकर्कशा ।तृष्णा परशुधारेव वल्गन्ति विनिकृन्तति

In plain words

Even the subtlest roots, as they stir — tṛṣṇā, harsh with its hardened heart, hews them down like the edge of an axe.