IMHO it is informal speech, and they omitted THAT and
Besides, sir, your refusal wounds my pride; I must
believe you think THAT my offer IS unworthy your
Oh, no: it is as formal as can be, for it is 18th-century
gothic. The pricipal characters talk like a book.
`think' works the same way as `consider', `deem', and
I consider exceptions harmful.
I deem him prim.
I find you kind.
I think her unkind.
1. See also Chandler's "Pearls are a nuisance", which made
laugh so hard I strained my belly muscles.
* Origin: nntp://news.fidonet.fi (2:221/6.0)