He says, in their eyes. He means, in their genitals.
Friar Laurence says young men's love resides not only in their hearts, but in their eyes.
"What happened to Rosaline who you were in love with a few hours ago?"
Friar Laurence advices moderation in love, not violent excess. Then Romeo, Juliet and Friar Laurence leave to get married.
When Romeo tells Friar Laurence that he's in love with Juliet, the Friar is initially surprised but then agrees to help them get married in hopes of ending the feud between their families.
Friar Laurence expresses fears about the consequences of rushing Romeo and Juliet's marriage, the potential conflicts that could arise between the Capulets and Montagues, and the fleeting nature of young love. He is worried that their hasty decision could lead to tragedy.
Friar Laurence accuses Romeo for misusing some things. Those are: love, wit and shape.
Friar Laurence questions Romeo's newfound love for Juliet because Romeo had recently been in love with another woman, Rosaline, and his affections seemed to change very quickly. The Friar was concerned that Romeo was acting impulsively and not genuinely in love.
In Act 2, Scene 6, Friar Laurence expresses fears of the reckless decision-making of Romeo and Juliet, worried that their young love may lead to dangerous consequences. He also expresses concerns about the explosive feud between the Capulets and Montagues, fearing that it may escalate and threaten the happiness of the young couple.
to help marry him and Juliet
Romeo calls Friar Laurence his "ghostly father" because the friar has taken on a paternal role in providing guidance and support to Romeo, especially in matters of love and relationships. The term "ghostly" emphasizes the spiritual and moral guidance that Friar Laurence offers Romeo.
Romeo tells his love for Juliet to Friar Laurence, who ultimately agrees to marry them in secret.
Presumably you are talking about Act 2 Scene 6. "Love moderately" is what the friar says.