The principle
Good judgment begins by distinguishing what you know from what you infer. Examine sources, seek disconfirming evidence, and make uncertainty visible before committing resources or persuading others. A confident explanation can still rest on a weak assumption. Slow down enough to identify the source of a claim, what it actually establishes, and what remains uncertain. Compare competing explanations and seek evidence that could prove your preferred one wrong. Useful thinking is willing to change. This practice is especially important when a persuasive story, a respected authority, or a desired outcome makes a claim feel true before it has been examined.
Put it into practice
Choose a decision with real consequences. Write the factual claim you are relying on and identify its source. Separate observations from interpretations, estimates, and hopes. Ask what information is missing and how much uncertainty the decision can tolerate. Take the smallest responsible next step while gathering better evidence, and record why you chose it so that later review remains honest.
Keep the distinction clear
Accurate thought is not collecting only supporting evidence or treating a strongly held belief as a verified fact.
Your practical exercise
- Prepare: Take one important belief about your project. Create three columns: observed facts, interpretations, and unknowns. Find one source that could challenge the belief.
- Act: Complete the smallest useful version and record what actually happened.
- Review: What evidence would cause you to revise your conclusion? Choose one adjustment before the next attempt.
What you are building: A fact-and-assumption ledger with a next research step.
Make this lesson yours.
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Bring it to the circle
Ask the circle to test your strongest assumption. Reward a useful correction rather than defending your first answer.
Based on Lesson 11 of Hill’s 1928 text. Explanations and exercises are original interpretations. Sources and editorial approach.