Quote 1
FRIAR LAURENCE
Holy Saint Francis, what a change is here!
Is Rosaline, whom thou didst love so dear,
So soon forsaken? Young men's love then lies
Not truly in their hearts, but in their eyes.
(2.2.69-72)
Friar Laurence makes a convincing argument that Romeo's love for Juliet could nothing more than a crush. Just days ago Romeo was crying his eyes out over another woman, the unattainable Rosaline. Now, the "salt water" tears haven't even dried yet and he's talking about a new love interest.
Okay, Friar Laurence has good reason to be skeptical of Romeo's newfound "love." But, if he's so skeptical of the relationship, why does he agree to secretly marry the young couple? Well, he tells us: "For this alliance may so happy prove/ To turn your households' rancour to pure love" (2.3.87-88).
In other words, Friar Laurence is crossing his fingers a union between Romeo and Juliet will force the feuding families to reconcile. But good intentions aren't enough. His meddling may not be solely responsible for the tragedy, but it's at least partly responsible. At the same time, Romeo and Juliet's love does eventually bring the two families together—but only after a double suicide.
Quote 2
FRIAR LAURENCE
But come, young waverer, come, go with me.
In one respect I'll thy assistant be,
For this alliance may so happy prove
To turn your households' rancor to pure love.
(2.3.96-99)
Friar Laurence doesn't believe that Romeo's love for Juliet is authentic (especially since Romeo was "in love" with Rosaline about two seconds ago), but he agrees to marry them anyway. What gives? Well, the Friar believes that a marriage between a young Capulet and a young Montague might be able to put an end to the long-standing family feud. Pretty conniving, don't you think?
Quote 3
FRIAR LAURENCE
Holy Saint Francis, what a change is here!
Is Rosaline, whom thou didst love so dear,
So soon forsaken? Young men's love then lies
Not truly in their hearts, but in their eyes.
(2.3.69-72)
The Friar thinks Romeo's love is meaningless because it is so changeable—just days ago, Romeo was supposedly in love with Rosaline but now he wants to marry Juliet. But that does that automatically mean it's not real this time?