The servant has a problem: his lord expects him to know what's written on the paper, but he can’t read. To express his exasperation he tries to recite from memory something he knows is written down. It’s a famous passage by the playwright John Lyly, a competitor of Shakespeare, who wrote in a very elegant, literary manner. Shakespeare makes fun of his rival by having the servant garble the sophisticated passage, inadvertently using words with bawdy meanings.