Thinking, Fast and Slow is a must-read for everybody. If you’ve ever wondered about how thinking “works”, this book provides some interesting abstractions that help understanding thought-processes.

More importantly, though, it also teaches a lot about the biases one has, how most people are susceptible (due to the nature of the brain) to them and how they can be (partially) mitigated. It helped me a lot to be much more reflected in my thoughts, because it’s often explained by such biases or heuristics.