Interest Quote by Karl Popper
“There will be well-testable theories, hardly testable theories, and non-testable theories. Those which are non-testable are of no interest to empirical scientists. They may be described as metaphysical.”
About This Quote
Source Book: The Logic of Scientific Discovery, 1934
Scientific theories must be testable; those that cannot be tested are considered metaphysical and lie outside empirical science.
In simple terms: Only testable theories matter to science.
Key Takeaway
Focus on falsifiable hypotheses.
Themes
science
philosophy
methodology
Mood
analytical
critical
Type
philosophical
explanatory
When to use this quote
- research design
- policy analysis
- technology assessment
- education curriculum
- public debate
Key Concepts
falsifiability
empiricism
metaphysics
Questions to Reflect On
- How do you decide if a hypothesis is truly testable?
- Can metaphysical ideas indirectly guide empirical work?
A Different Perspective
Non‑testable ideas can still inspire useful concepts, even if not scientific.
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