Friar Laurence delivers a speech about the power of herbs and plants to both heal and poison. Romeo enters and asks Friar Laurence's help in marrying Romeo and Juliet. Friar Lawurence marvels at how quickly Romeo switched from loving Rosaline to loving Juliet, but he also realizes that a marriage between a Montague and a Capulet just might put an end to the feud between the families, so he agrees to perform the ceremony.