Twelfth Night Act 3

In Act 3 Scene 1 Viola and the fool have a very "deep" conversation about words. I honestly didn't understand the point of this part of the scene and why it was necessary to the play. Viola talks to Olivia trying to make Olivia fall in love with Orsino: "Madam, I come to whet your gentle thoughts on his behalf." (III.i.107-108). Olivia tells Cesario that she is in love with him: "By maidhood, honor, truth, and everything, I love thee so that, maugre all thy pride, nor wit nor reason can my passion hide." (III.i.152-154). Viola finally sets her straight and tells her she does not love her back: "By innocence I swear, and by my youth, I have one heart, one bosom, and one truth, and that no woman has; nor never none shall mistress be of it, save I alone." (III.i.159-162). Olivia doesn't seem to give up hope: "Yet come again; for thou perhaps mayst move that heart which now abhors to like his love." (III.i.165-166). Olivia is pretty psycho inmy opinion. Cesario flat out tells her that he will never love her and she still seems to have hope that he'll come around. Talk about desperate!
In Act 3 Scene 2 Andrew is bummed because he saw Olivia flirting with Cesario: "Marry, I saw your niece do more favors to the Count's servingman than ever she bestowed upon me. I saw't i' th' orchard." (III.ii.5-7). Toby and Fabian tell Andrew to challenge Cesario to a fight: "Why then, build me thy fortunes upon the basis of valor. Challenge me the Count's youth to fight with him; hurt him in eleven places." (III.ii.34-36). Andrew decides to write a letter for Toby to give to Cesario. Then Maria enters and tells Toby and Fabian to watch her prank go into action: "If you desire the spleen, and will laugh yourself into stitches, follow me." (III.ii.68-69). I don't understand why Toby is playing a prank on Andrew with yet another letter but I guess it would be pretty entertaining to watch Andrew fight a guy who is really a girl.
In Act 3 Scene 3 Antonio and Sebastian are travelling and Sebastian wants to see some of the sights but Antonio can't: "I do not without danger walk these streets." (III.iii.25). Antonio tells Sebastian to meet him at the Elephant Inn. I think this scene was pretty short and boring, but I think it was necessary for an update on Sebastian.
In Act 3 Scene 4 Olivia is setting up for dinner when Malvolio enters all lovestruck: "Why appear you with this ridiculous boldness before my lady?" (III.iv.38-39). Malvolio starts quoting the letter he thinks Olivia wrote to him and Olivia, naturally, is confused. Cesario arrives and Olivia tells Maria to take care of Malvolio and the funny thing is that Malvolio thinks that everything is going according to plan: "Why, everything adheres together, that no dram of a scruple, no scruple of a scruple, no obstacle, no incredulous or unsafe circumstances--what can be said?" (III.iv.82-85). Fabian, Maria and Toby have some fun by picking on Malvolio and acting like there is a demon inside him. Andrew enters and gives Toby the letter he wrote: "Here's the challenge; read it. I warrant there's vinegar and pepper in't." (III.iv.149-150). Toby tells Cesario that Andrew wants to fight him, Cesario doesn't want to but draws his sword anyway and Antonio interrupts, thinking that Cesario is Sebastian, which makes Viola believe that her brother is alive. This scene was very important to the play and I'm anxious to see if Viola discovers her brother and what will happen if she does.