It seems everyone in Romeo and Juliet are impatient, which could be a leading factor to the tragedy of these two young lovers. Romeo is impatient from his first sighting of Juliet. He determines right then and there that he is in love with her. Impatience is a running theme throughout the play.
When Romeo first sets his eyes on Juliet, he is totally in love with her, and has to make a way to see her. His impatience of his "love" for her, is shown throughout the whole scene of the Capulet ball. He is impatient to have her, that he is willing to risk being found out who he really is, for the sake of being with Juliet.
Juliet is just as impatient. She is love and in love. She wants to marry Romeo right away. She knows their families have a huge grudge against each other, yet she is not thinking about that, all she is consumed with, is that she and Romeo can be together right away. When she sends her nurse to see Romeo, she anxiously awaits her arrival with word of their wedding.
"The clock struck nine when I did send the nurse; In half an hour she promised to return. Perchance she cannot meet him. That's not so....."
The Capulets, on the other hand, are extremely impatient to have Juliet marry Paris. They think that Paris is the perfect match for her. He comes from a good aristocratic family and will elevate Juliet's social standing. They are extremely worried about her relationship with a Montague, so they are impatient to have her married off to someone else. They push their young daughter to marry a man she doesn't love.
If Romeo, Juliet and the Capulets had not been so impatient, and if they had given their families time to see if they could accept them, then maybe the tragedy wouldn't have happened. However, their impatience set the events in motion, and keeps us talking about it centuries after it was written.