Verse 21

प्रज्ञाविरहितं मूढमापदल्पापि बाधते ।पेलवाचानिलकला सारहीनमिवोलपम्

In plain words

Even a small calamity afflicts the fool who is devoid of prajñā, as a slight current of wind afflicts a blade of grass that is without substance.