When writing a critical essay, how should the essayist approach the subject?

an essayist should pick several items to evaluate.
an essayist should analyze all the parts of the book.
an essayist should limit the items to be evaluated into a single sentence.
an essayist should borrow idea from other essays.

i would say that these are the two thesis statements best for a literary analysis essay on recurring themes in shakespeare's romeo and juliet:

1.  in romeo and juliet, shakespeare demonstrates that love comes in a variety of forms, be it romantic, familial, or between friends.

2.  shakespeare explores the struggle for identity through the character of juliet in his play romeo and juliet.

the other theses aren't reoccurring in this play. 

explanation: