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Full Idea
Duns Scotus grounded certitude in the knowledge of self-evident propositions, induction, and awareness of our own state.
Gist of Idea
Certainty comes from the self-evident, from induction, and from self-awareness
Source
report of John Duns Scotus (works [1301]) by Stephen D. Dumont - Duns Scotus p.206
Book Ref
'Shorter Routledge Encyclopaedia of Philosophy', ed/tr. Craig,Edward [Routledge 2005], p.206
A Reaction
Induction looks like the weak link here.