Shakespeare uses these lines to emphasize the difference between Paris and Romeo, who is Juliet's true love. Paris is characterized by conventional decorum, formality, and a superficial understanding of love. His speech is described as "ill-timed" as he fails to read the emotional atmosphere and the tension in the Capulet household, which is already grieving over the death of Juliet's cousin Tybalt.
The phrase "ill-omened" suggests that Paris's words carry a sense of foreboding and misfortune, hinting at the tragic events that will unfold later in the play. By describing Paris's speech in this manner, Shakespeare creates dramatic irony and foreshadows the disastrous outcome of the ill-fated romance between Romeo and Juliet.