Hi.. so basically when he says 'the task (of parliament) is of a different nature to those who...' he goes on to give two examples of people (members of parliament) The first example is of those who don't make promises because they have no intention of dealing with a particular issue (or they dont have the power to do so) And the second example is of those who 'delude the understandings' (cause confusion of the matter), rather than outright blatantly violate the liberty of 'fellow subjects' Hope this helps

No wonder you are confused Grace, it is more or less as clear as mud! (I think we know each other do we not?). He sure likes to use negatives, doesn't he! Try negating the negatives! Make them positives: The task is of another nature to THAT OF those who will only promise what they can do and intend to do, and whose principles do not let them delude or violate liberty. No guarantee my understanding is quite correct!

The meaning of 'rather than' comes from the 'than to violate'.. however the 'no more' is like old English, you won't hear it in a lot of Spoken Word unless it's from an old era, particularly Parliamental speeches, which actually means 'at the bare minimum'