Question 1

What is the difference between Acatalepsy and Katalepsis?

Accepted Answer

Katalepsis is the claim that some impressions announce their own truth. Acatalepsy is the counter-claim that none can. The whole quarrel of Hellenistic epistemology fits inside that pair.

Question 2

How do I know if I mean Acatalepsy rather than Katalepsis?

Accepted Answer

Readers who land here meaning Acatalepsy rather than Katalepsis are usually searching for phrases like “what is acatalepsy”, “can anything be known for certain”, “academic skepticism vs pyrrhonism”.

Aspect	Acatalepsy	Katalepsis
Claims	Nothing can be grasped	Some things can
School	Academic Skeptic	Stoic
Criterion of truth	None available	The cognitive impression
Practical answer	The plausible	Assent

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Acatalepsy

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