C.S. Lewis discusses the phenomenon at length in the essay "The Funeral of a Great Myth", under the names "evolutionism", "development" and "emergence". Others have spoken of "progress" and "perfectibility". He carefully distinguishes it from any valid biological hypothesis. Indeed, he traces it to at least as far back as Wagner and Keats' "Hyperion", 40 years before the publication of the Origin of the Species.
For my purposes, the most interesting things he concludes about the myth are these:
- The imaginative impulse came before, and legitimated, the scientific evidence. In other words, confirmation bias was (in part of society, at least) on the side of Darwinism when it appeared. (Don't worry, I'm not turning into a creationist...)
- In modernist fashion, 19th-century "evolutionism" turned "progress" into a universal principle. I would wager that liberal theology showed this tendency pretty early.
- It was artistically counterbalanced by the notion of the universe dying with a whimper through entropy ("true to the Elizabethan Tragedy" according to Lewis).
Unfortunately Lewis was wrong about the lifetime of this myth. It is with us today. One can still hear people praising something because "it is historically inevitable", "the way of the future" and so forth - as if there were no Roman Empire before the Dark Ages (another can of worms, for another post). Likewise, certain beliefs are denigrated as "obscolescent", "outmoded" etc. Chesterton rightly compares such nonsense with saying, "You can't believe X - this is the second Tuesday of August!" Elsewhere, Lewis warns that barbarism is not "behind us" - it is below us. We should tread carefully.
That's all I want to say on this particular topic for now. But you should soon start noticing something that looks suspiciously like a coherent view of the history of ideas. It is no coincidence that Feyerabend speaks like Chesterton on this point...