Twelfth Night

What a plague means my niece, to take the death of her brother thus? I am sure care’s an enemy to life.” Sir Toby to Maria upon entering scene (1.3.1). Toby worries about Olivia’s mourning and suggests that caring (or perhaps responsibility) impedes on fun
Troth, sir, I can yield you none without words., and words are grown so false I am loath to prove reason with them.” Feste to Viola (Cesario) (3.1.23-25). Feste cuttingly and philosophically muses to Viola on how words are twisted.
Alas, poor fool, how have they baffled thee!” Olivia to Malvolio after Fabian has revealed their plot (5.1.369) Olivia takes pity on Malvolio’s humiliation
Lady, cucullus non facit monachum; that’s as much to say as, I wear not motley in my brain.” Feste to Olivia (1.3.52-54) I may appear a fool, but am not inwardly. Playing on disguise and things not seeming to be what they appear
Let fancy still my sense in Lethe steep; / If it be thus to dream, still let me sleep!” Sebastian’s aside (4.1.61-62). Olivia (mistaking Sebastian for Cesario) declares her love to which Sebastian is baffled and does not want to understand.
This fellow is wise enough to play the fool; / And to do that craves a kind of wit.” Viola’s soliloquy (3.1.60-61). Viola contemplates Feste’s nature after her second encounter (at Olivia’s) with him.
And thus the whirligig of time brings in his revenges. Feste musing aloud (5.1.376). After Toby’s tricks are out, Feste says that he had it coming indicating Malvolio’s previously sour nature towards him.
I say, there is no darkness but ignorance. Feste (as Sir Topas) to Malvolio (4.2.43-44) Feste says that the house is not dark, but Malvolio ignorant of the trick played on him and his disguise
If music be the food of love, play on.” Orsino to musicians/audience (1.1.1). Opening lines indicate Orsino’s lovesickness. A feeling he want to wallow in, just like Olivia wants to wallow in her grief
I’ll be revenged on the whole pack of you.” Malvolio to all (even audience?) (5.1.377) Malvolio storms off after finding out about Toby’s trick and swears his revenge, but is this a harmless threat that can be soothed or does it have darker implication?