act3: what are 3 reasons that Friar Laurence thinks that romeo should be happy???

He says that Juliet is alive, Tybalt did not kill him, and he escaped death by being merely banished. 

Thy Juliet is alive,
For whose dear sake thou wast but lately dead—
There art thou happy. Tybalt would kill thee,
But thou slew’st Tybalt—there art thou happy.
The law that threatened death becomes thy friend
And turns it to exile—there art thou happy.
A pack of blessings light upon thy back,