| Quote #4
Beatrice denounces marriage in general, but you’ll note that she goes on to point out the particular flaws of particular men. We’re left to guess whether she is against the institution of marriage in principle, or whether she’s simply convinced she’ll never find the right man. (Or is her man-bashing a consolation prize because she hasn’t found anyone yet?) Lots of possibilities, but the point is, she’s not stoked about marriage.
| Quote #5
Essentially, Leonato is saying, "You’ll know your answer because I told you your answer." Thus we add one more facet to the presentation of marriage in the play: it’s not necessarily an arrangement made out of love, but more like a transaction that can be worked upon and influenced by outside forces.
| Quote #6
It’s notable that Benedick brings up marrying Beatrice, though no one else has even mentioned it. Stating so passionately that it’s not on his mind shows that, actually, it’s on his mind.