The very first words Romeo utters about Juliet are actually in Act 1 sc 5 : "O, she doth teach the torches to burn bright!" In Act sc 2 Romeo furthers his metaphors to Juliet and light,
But soft! What light through yonder window breaks?
It is the East, and Juliet is the sun!
Arise, fair sun, and kill the envious moon,
Who is already sick and pale with grief