Novum Organum by Francis Bacon

Bacon wrote the Novum Organum as a replacement for Aristotle's Organon — a new instrument for understanding nature. His central argument: before you can investigate the world, you have to understand how your own mind distorts reality. The human understanding "is of its own nature prone to suppose the existence of more order and regularity in the world than it finds."

The heart of the work is Bacon's taxonomy of four Idols — systematic errors that corrupt human understanding:

• Idols of the Tribe: Biases inherent to human nature. We see patterns where none exist, we favor confirming evidence, and our senses deceive us. These are species-wide failure modes.
• Idols of the Cave: Each person's private distortions — shaped by education, temperament, reading, and experience. Your particular background makes you overweight certain kinds of evidence and ignore others.
• Idols of the Marketplace: Errors created by language itself. Words are formed for common use and "draw lines of distinction according to the understanding of the crowd." Imprecise language creates imprecise thought.
• Idols of the Theatre: Received doctrines and systems of thought accepted on authority. Bacon compares philosophical systems to stage plays — "worlds of their own creation after an unreal and scenic fashion."

Bacon's remedy is systematic observation, experiment, and induction — building knowledge from carefully gathered particulars rather than from first principles handed down by authority. He argues for patience over brilliance: "the lame man who keeps to the right road outstrips the runner who takes a wrong one."

The Novum Organum matters to PKL as the origin of bias taxonomy. Kahneman's heuristics and biases program, Munger's 25 cognitive tendencies, and the entire behavioral economics tradition are descendants of Bacon's four Idols. Reading Bacon shows you that the problem of self-deception in human reasoning was identified and catalogued four hundred years ago — and that we are still working on the same problem.