Full Idea
Dogmatists define proof as "an argument which, by means of agreed premises, reveals by way of deduction a nonevident inference".
Gist of Idea
Proof moves from agreed premises to a non-evident inference
Source
Sextus Empiricus (Outlines of Pyrrhonism [c.180], II.135)
Book Reference
Sextus Empiricus: 'Outlines of Pyrrhonism', ed/tr. Bury,R.G. [Prometheus 1990], p.141