Or “prove themselves good,” as in the Prior Analytics, ii 25, [Greek: apanta pisteuomen k.t l] but the other rendering is supported by a passage in Book VIII. chap. ix. [Greek: oi d’ upo ton epieikon kai eidoton oregomenoi timaes bebaiosai ten oikeian doxan ephientai peri auton chairousi de oti eisin agathoi, pisteuontes te ton legonton krisei]

[Greek: thesis] meant originally some paradoxical statement by any philosopher of name enough to venture on one, but had come to mean any dialectical question. Topics, I. chap. ix.