In these lines what does Romeo compare Juliet to?

To Juliet.

If I profane with my unworthiest hand

This holy shrine, the gentle sin is this,

My lips, two blushing pilgrims, ready stand

To smooth that rough touch with a tender kiss.

Good pilgrim, you do wrong your hand too much,

Which mannerly devotion shows in this:

For saints have hands that pilgrims’ hands do touch,

And palm to palm is holy palmers’ kiss.

Have not saints lips, and holy palmers too?

Ay, pilgrim, lips that they must use in pray’r.