These often-quoted lines can be found in Act II scene ii (lines 43-44). the balcony scene, where the family names cause the first complication in their romance. Juliet (a Capulet) asks the universe why the name of something should change that thing’s qualities. Romeo (a Montague) is standing unseen below her. The false notion that a name prescribes the qualities of a thing then pervades the play–what looks like poison is really a sleeping potion; what looks like death is really an induced sleep; what looks like suicide is really a device to give life to their union; what goes by the name of romance is actually a tragedy brought on by names. These famous lines have become a cliché for every occasion where the signifier (the name) does not match the signified (the object or quality.) Opponents of capital punishment, for example, claim it is murder, given a different name.
act two scene two
julliet says this thinking that romeo cannot hear her however he is hidding and listening to this.