Romeo and Juliet are having a meaningful conversation and use religious metaphors. Juliet is referred to as a saint and Romeo as a pilgrim who tries to erase his sin. He tries to convince her to kiss him.
Oh dear saint, let our lips do what our hands do. My hands are praying for a kiss. Hurry before our faith turns to sorrow.
Saints don't act irrationally however they do respond to prayers.
Romeo and Juliet lean in for their first kiss. Then, they talk again using religious metaphors and kiss again.
Thanks to you my sin has purged from my lips.
My sin on your lips?! It can't be true. If so, give my sin back.
Your sin has passed to my lips from yours.
The Nurse comes in and tells Juliet that her mother is calling. Romeo then talks with the Nurse about Juliet.