[ksymph]

I think the use of "progress" in the quote is somewhat ironic -- "movement towards a perceived refined [...] state", as the definition puts it; an unreasonable person's perception of progress likely doesn't match up with a reasonable person's.

As I see it, the quote neither advocates nor critiques unreasonableness, but rather observes that unreasonable people are most often the ones responsible for change. Whether you take that as a lesson on the merits of unreasonableness, the dangers of it, or something in between, is up to interpretation, and depends on how much one values reasonableness vs progress (for the record, I've heard the quote more often in a negative sense by people who put reasonableness above "progress"). It also depends on one's definition of "reasonableness" of course, and whether something can be unreasonable yet still a positive.

So I guess my point is that the quote can mean just about whatever you want it to mean. It's an interesting litmus test. I do agree that people using it as carte blanche for unreasonableness in the name of some sort of nebulous "progress" is, well, unreasonable, though with context I'm certain GP was using it as more of a critique.