His, "The True Believer" is the one that I have. I bought it in the seventies as recommended by either Rand or Branden. Hadn't read it since then but that goes for most of the 1500 books that I collected for when I got near that Shakespearean seventh age of man which Biden seems to have entered.
I was hoping for much of my life that humanity would grow bright and objectively rational but have watched it descend more and more into supernaturalism and authoritarianism, especially here in the USA. It started a quick downward spiral with the acceptance of the idea of the US as a "homeland" resulting in homeland security and now the "disinformation board" will end in government censoring even of thought.

Here in the Gulch I expected to be among those who are fully rational but find some advocating pseudoscience, non-evidentiary medicine, and a few for faith over reason.