Read the excerpt from "One Generation Passeth Away and Another Cometh.” Vain bird, a while think what am I, Here entering ‘mid a hawk-like throng; Quickly hatched out, as quick to fly, And dare not tarry long. Where is the mighty and the stout, Who lived this fading world to crave; Left and forever gone without A stone to show their grave. Which universal theme is reflected in the excerpt?