Definition
A priori knowledge has limits: reason can constrain possible worlds, but empirical observation is needed to know which world we inhabit.
Why It Matters
Relying solely on reason without empirical grounding leads to logically perfect but practically useless models that fail to describe the actual world. Understanding these limits prevents the ‘ivory tower’ fallacy and ensures our intellectual efforts are tethered to observable reality.
Core Concepts
- Logic and mathematics can reveal necessary relations.
- Observation connects abstract possibility to actual reality.
- Pure reason cannot determine contingent facts about the universe.
- Naturalism respects both rational structure and empirical constraint.