In Romeo and Juliet, how does Friar Lawrence convince Romeo not to commit suicide?

In a rather lengthy speech in Act III scene 3 of this
excellent tragedy, Friar Lawrence berates Romeo for trying to kill himself, and then
goes on to explain to him the many reasons he should have for being happy to prevent him
from trying to do it again. Note the positive spin that Friar Lawrence gives to Romeo's
otherwise desperate and bleak situation:

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What, rouse thee, man! Thy Juliet is
alive,

For whose dear sake thou wast but lately
dead.

There art thou happy. Tybalt would kill
thee,

But thou slewest Tybalt. There art thou
happy.

The law, that threatened death, becomes they
friend

And turns it to exile. There art thou
happy.

Note the way the
repetition of the phrase "There art thou happy" reinforces Friar Lawrence's central
message of how much Romeo has to be thankful for. These separate happinesses convert
themselves, in his words, into a "pack of blessings light upon thy back." The Friar is
thus able to convince Romeo to hold off from killing himself with hope in a future where
they can make their marriage known and when Romeo and Juliet can finally be reunited for
ever.