Friar Lawrence agrees to perform the secret marriage ceremony for Romeo and Juliet. Although initially skeptical of Romeo's sudden change of heart from Rosaline to Juliet, Friar Lawrence consents to marry them in hopes that their union will end the long-standing feud between the Montague and Capulet families. He expresses this hope explicitly, saying the marriage "may so happy prove to turn your households' rancor to pure love"

. Additionally, after the marriage and subsequent events, Friar Lawrence agrees to help Romeo by allowing him to spend the night with Juliet before Romeo must leave Verona to go into exile in Mantua. The Friar promises to keep Romeo informed through Balthasar and suggests that Romeo might eventually be allowed to return to Verona if the Prince relents

. In summary, Friar Lawrence agrees to:

• Secretly marry Romeo and Juliet, hoping to reconcile their feuding families.
• Assist Romeo by arranging for him to spend the night with Juliet before his exile.
• Keep Romeo updated on news from Verona and hold hope for his return