Just because science doesn't know everything doesn't mean you can fill in the gaps with whatever fairy tale most appeals to you.
He also paraphrases what I've seen described as "the Minchin Principle" a few sentences later.
...and then we tested [herbal medicine] and the stuff that worked became... medicine. And he rest of it is just a nice bowl of soup and some potpurri.
Here's the new thread for posting quotes, with the usual rules: