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,
That thou, her maid, art far more fair than she:
Be not her maid, since she is envious;
Her vestal livery is but sick and green
And none but fools do wear it; cast it off.
It is my lady; O, it is my love!
O, that she knew she were!
(Act 2, Scene 2)
In this passage, Romeo compares Juliet to the sun, which is a metaphor for her beauty and power. He also says that the moon is "sick and pale with grief" because Juliet is more beautiful than she is. This suggests that Romeo believes that Juliet is destined to be with him, and that nothing can stop their love.
However, Romeo also says that Juliet should "cast off" the "vestal livery" of the moon, which suggests that she has the free will to choose her own path. This suggests that Romeo believes that Juliet has the power to choose whether or not to be with him.
Overall, this passage suggests that Romeo believes that both fate and free will play a role in human relationships.