Oh, there's a book? When I google it that quote only shows up on conspiracy theory sites
Also still waiting for you to clear up the part where he says the illuminati had NOT infiltrated America.
You can view it in here...not sure if that's proof for you (not that it matters but you asked so I attempted to give you)
And he says "it wasn't his intention" so they could have/could not have made it to America. Perhaps he was against them and I read it incorrectly at first. Appearently, the reason the wrote the letter was because John Robison (professor at Edinburgh Universiy and Scottish freemason) wrote to him that he was asked to join the illuminati.