What famous remark does marcellus make about denmark? (that relates to the motif of decay)? act one act 4

Assuming you're talking about the play "Hamlet," I believe the line is "Something is rotten in the state of Denmark." Marcellus said it in Act 1, Scene 4 when speaking to Hamlet about the corrupt rulership of his uncle and stepfather, King Claudius.

the tone of the passage is sympathetic to the forbidden love of romeo and juliet. the nurse plays a significant role in the play. she is responsible for making their meeting again possible. additionally, there is a sense of warning in the choice of words of the nurse. she seems to be authoritative when she calls romeo "scurvy knave", and at the same time the fact that she addresses to him as "sir" reflects respect. the nurse is "vexed", this word describes her confused state of mind. on the one hand, she finds romeo a fine and eloquent man, but on the other, it is thought that man's nature forces men to try to trick women.