Demanding and Rigorous

From a New York Times column by Nicholas D. Kristof.

Centuries ago, serious religious study was extraordinarily demanding and rigorous; in contrast, anyone could declare himself a scientist and go in the business of, say, alchemy. These days, it’s the reverse. A Ph.D. in chemistry is a rigorous degree, while a preacher can explain the Bible on television without mastering Hebrew or Greek — or even showing interest in the nuances of the original texts. 

 Hmmm...