How do you reach the unreachable? Naturally, the topic is much larger than a single blog entry, but I did run accross an interesting post by Jon Udell that outlines Charles Darwin's rhetorical strategy in the book, On the Origin of Species (which popularized the theory of evolution).
Darwin, says Slatkin, was like a salesman who finds lots of little ways to get you to say yes before you're asked to utter the big yes. In this case, Darwin invited people to affirm things they already knew, about a topic much more familiar in their era than in ours: domestic species. Did people observe variation in domestic species? Yes. And as Darwin piles on the examples, the reader says, yes, yes, OK, I get it, of course I see that some pigeons have longer tail feathers. Did people observe inheritance? Yes. And again, as he piles on the examples, the reader says yes, yes, OK, I get it, everyone knows that that the offspring of longer-tail-feather pigeons have longer tail feathers.I think Udell simplifies the inception and development of the idea of evolution, but I think the point generally holds. Darwin's ideas didn't come into mainstream prominence until he published his book, decades after he had begun his work. Obviously, Darwin's strategy isn't applicable in every situation, but it is an interesting place to start (I suppose we should keep in mind that evolution is still controversial amongst the mainstream)...
By the time Darwin gets around to asking you to say the big yes, it's a done deal. You've already affirmed every one of the key pillars of the argument. And you've done so in terms of principles that you already believe, and fully understand from your own experience.
It only took a couple of years for Darwin to formulate the idea of evolution by natural selection. It took thirty years to frame that idea in a way that would convince other scientists and the general public. Both the idea, and the rhetorical strategy that successfully communicated it, were great innovations.