Which excerpt from Act V, scene iii of Romeo and Juliet best reflects the play’s overall theme?

Lady Capulet: O me! this sight of death is as a bell,
That warns my old age to a sepulchre.
Prince: See what a scourge is laid upon your hate,
That heaven finds means to kill your joys with love;
Romeo: Hold, take this letter; early in the morning
See thou deliver it to my lord and father.
Montague: O thou untaught! what manners is in this,
To press before thy father to a grave?