The philosophical tradition. For philosophers, truth exists. Therefore one s first duty is to discover it. But what tastes or looks good may not really be good.
Rhetorical sugar can disguise untruth s poison or make-up mask murderous intent.
One must take care. Truth is healthy, rhetoric by itself anything but. The rhetorical tradition. Rhetoricians are likewise uncertain about discovering truth if it does exist, distinguishing it from untruth if it can be discovered, and communicating it if it can be distinguished from untruth. Given such uncertainty about truth, one appears to have only opinion .