Years ago, Ben Casnocha in the best response papers mentioned an idea to me that I haven't been able to shake: The people who are most likely to change our minds are the ones we agree with on 98 percent of topics.
If someone you know, like, and trust believes a radical idea, you are more likely to give it merit, weight, or consideration. You already agree with them in most areas of life. Maybe you should change your mind on this one too. But if someone wildly different than you proposes the same radical idea, well, it's easy to dismiss them as a crackpot.
One way to visualize this distinction is by mapping beliefs on a spectrum. If you divide this spectrum into 10 units and you find yourself at Position 7, then there is little sense in trying to convince someone at Position 1. The gap is too wide. When you're at Position 7, your time is better spent connecting with people who are at Positions 6 and 8, gradually pulling them in your direction.
The most heated arguments often occur between people on opposite ends of the spectrum, but the most frequent learning occurs from people who are nearby. The closer you are to someone, the more likely it becomes that the one or two beliefs you don't share will bleed over into your own mind and shape your thinking. The further away an idea is from your current position, the more likely you are to reject it outright.
When it comes to changing people's minds, it is very difficult to jump from one side to another. You can't jump down the spectrum. You have to slide down it.
Any idea that is sufficiently different from your current worldview will feel threatening. And the best place to ponder a threatening idea is in a non-threatening environment. As a result, books are often a better vehicle for transforming beliefs than conversations or debates.
In conversation, people have to carefully consider their status and appearance. They want to save face and avoid looking stupid. When confronted with an uncomfortable set of facts, the tendency is often to double down on their current position rather than publicly admit to being wrong.
Books resolve this tension. With a book, the conversation takes place inside someone's head and without the risk of being judged by others. It's easier to be open-minded when you aren't feeling defensive.
Arguments are like a full frontal attack on a person's identity. Reading a book is like slipping the seed of an idea into a person's brain and letting it grow on their own terms. There's enough wrestling going on in someone's head when they are overcoming a pre-existing belief. They don't need to wrestle with you too.
