"If you are a person of the same sort as myself I should be glad to continue questioning you: if not, I can let it drop. Of what sort am I? One of those who would be glad to be refuted if I say anything untrue, and glad to refute anyone else who might speak untruly; but just as glad, mind you, to be refuted as to refute, since I regard former as the greater benefit" Socratic dialogue Gorgias, by Plato......... found it on a wall poster.