The entire book is about when and how these statements turn out to not be absolutely true. And it's not a short book. I don't have my copy in front of me right

The entire book is about when and how these statements turn out to not be absolutely true. And it's not a short book. I don't have my copy in front of me right now, so I won't get into specifics. But I consider it one of the most important books I've read, if only for making me realize how difficult it is to get distributed systems correct. Or, rather, learning that getting distributed systems correct is impossible and what sort of tradeoffs you can make in order to keep things mostly working. And it turns out that most services that I find myself working on these days are distributed systems, so having a healthy respect for all the ways things can break is a useful place to be.