Full Idea
Some optimists think understanding arises only through demonstration, but say there could be demonstration of everything, for it is possible to demonstrate in a circle or reciprocally.
Gist of Idea
Maybe everything could be demonstrated, if demonstration can be reciprocal or circular
Source
Aristotle (Posterior Analytics [c.327 BCE], 72b16)
Book Reference
Aristotle: 'Posterior Analytics (2nd ed)', ed/tr. Barnes,Jonathan [OUP 1993], p.5
A Reaction
I'm an optimist in this sense, though what is being described would probably best be called 'large-scale coherence'. Two reciprocal arguments look bad, but a hundred look good.
Related Ideas
Idea 574 Not everything can be proven, because that would lead to an infinite regress [Aristotle]
Idea 12937 We shouldn't just accept Euclid's axioms, but try to demonstrate them [Leibniz]