mules are not stubborn simply because they feel like; they refuse to do things if they think it’s a bad idea, or if they do not trust the human commanding them. I think it’s really interesting that for many centuries, humans have been able to get horses (and humans, for that matter) to charge into battle to meet violent deaths. You simply can’t get a mule to do that, because mules know better.

— McKinley Valentine, #181: Much better than horses, The Whippet, 2024 (via)