What does "authority" mean in a Buddhist context? From what little I know about it, Buddhism isn't like the Catholic church, where everything is a hierarchical pyramid with a single individual at the top, through which authoritative declarations can be made. Plus, schools like Theravada and Zen seem to differ quite significantly from each other, so an authority according to one might be a heretic according to the other. So how is authority assigned in practice, and is it universally recognized among all people who call themselves "Buddhists"?