CF Dictionary · Evaluating Ideas & Arguments
Universal Premise
A premise of the form 'all X are Y'. Universal premises are the only reliable source of decisive positive arguments.
A universal premise is a premise of the form "all X are Y" — "all men are mortal", "all swans are birds", "all refutations are fallible". Universals are powerful but dangerous.
Why universals matter
Universals are the only source of decisive positive arguments. From:
- Universal: all men are mortal.
- Instance: Socrates is a man.
We can decisively conclude: Socrates is mortal. This is the standard deductive syllogism.
CF follows CR in noting this works because of the universal. Remove the universal and you can't deduce.
Why universals are dangerous
Universal premises are themselves fallible. "All swans are white" was refuted by discovering black swans in Australia. "All men are mortal" might be refuted by a technological breakthrough. CF's stance: accept universals tentatively and look for counter-examples.
Connection to refutation
Because universals are vulnerable to a single counter-example, universals are the easiest target for decisive refutation. This is why CF focuses on criticism of universals rather than weighing positive evidence for them.
"You can make decisive positive arguments using universal premises (e.g., 'All men are mortal.') which as a premise are fallible." — criticalfallibilism.com