6 ideas
Soldier mindset is motivated reasoning: we ask 'Can I believe this?' of ideas we like and 'Must I believe this?' of ideas we dislike, treating beliefs as positions to defend. Scout mindset is the drive to see things as they are, treating beliefs as a map to be corrected. The difference is not intelligence but which question you ask of evidence.
To catch motivated reasoning, rerun your judgment with one variable swapped: the double standard test (would I judge this the same if the other side did it?), the outsider test (what would someone new to the situation conclude?), the conformity test (would I still hold this view if my peers didn't?), the selective skeptic test (would I accept this evidence if it pointed the other way?), and the status quo bias test (would I choose this if it weren't already the default?). A changed answer reveals that your reasoning was driven by your stake, not the evidence.
Instead of holding beliefs as certain or false, assign them probabilities and check whether your 70% claims come true about 70% of the time. To find your real confidence, imagine choosing between betting on your belief and betting on a lottery with known odds; the point where you're indifferent is your actual credence. Well-calibrated people can act decisively while admitting uncertainty, because they know how much they don't know.
People adopt soldier mindset because it buys comfort, self-esteem, morale, persuasion, image and belonging. Galef argues each benefit can be obtained without distorting beliefs: comfort from focusing on what you can control, motivation from accurately weighing a bet worth taking even at low odds. Since self-deception systematically underestimates its costs to decision-making, the trade is rarely worth it.
Changing your mind need not mean confessing 'I was wrong'; it can mean updating, an incremental revision in response to new evidence, the normal operation of good thinking rather than a humiliating reversal. Scouts treat being wrong as information and even seek out the observations that confuse them, since anomalies that don't fit the current model signal where the map is off.
When a belief becomes part of who you are, political, professional or tribal, challenges to it feel like attacks, and you defend rather than evaluate it. Holding identity lightly means treating labels as contingent descriptions rather than badges, while making 'someone who seeks truth' the identity you take pride in. That identity then rewards changing your mind instead of punishing it.