स्पन्दमात्रार्थमेवाशु दृश्यन्ते नार्थकारिणः ।तर्जनं गर्जनं मूढाद्धनुर्दण्डगुणादिव
In plain words
Swiftly they are seen, only for the sake of mere movement, accomplishing no purpose. The threats and roars that come from the fool are like [the twang] from a bow's staff and string.