I was curious about the origin of the saying, "Never talk about politics or religion in polite company." One of the oldest references that came up on Google was The Letter Bag of the Great Western (1840) by Thomas Chandler Haliburton. I needed to track down this book and I was in luck: there was a copy at the Toronto Reference Library. I went down a serious rabbit hole that day. Let me tell you about the best bits.
https://manyroads.ghost.io/the-letter-bag-of-the-great-western/