santayana

I've been finding audio lately.
Here's chapter 3 of George Santayana's "Some Turns of Thought in Modern Philosophy".
I haven't absorbed it all yet, but the first part on separation of duties between experts and scientists (thinkers?) is right along the lines of what I have been thinking about and dealing with.
Later he concludes that relativity is a welcome, acceptable revolution in science, but with it must come humility. I'd like to understand better what he's saying here.