I have to admit I have a bias against this type of book (whatever it is; the back of the review copy categorizes it as "Business & Economics—Motivational), but I enjoyed reading this more than I expected to. The only other time I've read books that I would describe as broadly in this category was in grad school (specifically this book), where I had a similar experience. For one thing, it was easy to read. It served as a surprisingly nice break from the heavy novel I was reading. I'll also confess that while reading this book, I did sometimes reflect on my own willingness (or lack thereof) to rethink my assumptions from time to time. I wouldn't describe myself as the most open-minded person; I'm aware of at least some of my biases, and I'm not always willing to check them. (I do make an active effort to reflect on and explore my biases when it comes to people, but less so my biases when it comes to, say, books like this one. I'm not apologetic when it comes to some of my opinions, and I don't believe I should be.)
The book makes a distinction—one that I actually think is important—about not conflating your values with your opinions or beliefs. You can stay true to your values, but change your opinions and beliefs as you get new information. The idea of reflecting on your values and your beliefs, and understanding that your beliefs may evolve, is a good one. But despite the emphasis on values, the book spent little time talking about them; its focus was on the changeability of opinions and beliefs. The book rankled me when it sometimes seemed to imply a sort of equivalence between various positions on a topic. There's a section devoted to predictions that particularly bugged me. It talked about how predictors improved their predictions by regularly reassessing them and not getting too attached to their original prediction. The predictions in question were mostly about presidential elections. The emphasis of the whole argument was on how to predict better, with the accuracy of the prediction being given more weight than the outcome of the election. (Granted, I do see that with better predictions, perhaps there are actions that could be taken to affect the outcome—it just felt like the whole emphasis was on the wrong thing.) Similarly, a section about getting people with opposing views to reach some level of mutual respect and possibly even agreement, the topics are things where I don't think mutual respect or agreement should be the goal. This reaction of mine is precisely what the book is trying to dismantle, but when Grant came out with a suggestion that, for instance, people on opposite sides of the case for the death penalty might reach some agreement, my own defenses shot up because I don't see this as a place where there is any center that I could move toward: the government should not be in the business of killing people.
On Father's Day morning, while hanging out with my dad in West Philadelphia, I was telling him about the book. It really wasn't about diversity, I said. I thought it had been recommended to our company with a particular audience in mind: old white guys. We can all get stuck in our beliefs and ways sometimes, but it seemed to me that what the book was counseling: breaking cycles of overconfidence, practicing humility, and even (seriously) the benefits of impostor syndrome, was not a message for the marginalized. When, for instance, lack of humility is a criticism frequently leveled at Black athletes (and Black people celebrating their own greatness generally), this advice can sound dangerously close to the rhetoric white people have been preaching forever. Women and others who have experienced impostor syndrome know that one effect is that might make one work harder (which is, in effect, the supposed benefit touted in the book). It's a truth that's become a cliché that Black people have to be twice as good to do half as well as white people in America. This isn't to say that humble self-reflection couldn't benefit everyone, but the message of this book seems calibrated to people who have not been told their whole lives to know their place.