It worked for Aquinas, but would it work for us?

I want to pull something Keith Parsons just said from out of the comments, since it ties in nicely with some questions prompted by one of the books I'm currently reading. Keith said:
. . . collapsing the fact/value distinction does not need neuroscience; it goes back to Aristotle. Really, the idea that there is a fact/value dichotomy has only become entrenched in ethics since Hume's "discovery"