I had read bits and pieces of Karl Marx's writings (or at least the English translations) before I became involved with The Way so, when I heard Wierwille misquote it (Advanced Class, perhaps?), I knew the source, even though he did not cite it. Here, by the way, is what Marx actually said: "Religion is the sigh of the oppressed creature, the heart of a heartless world, and the soul of soulless conditions. It is the opium of the people." - Karl Marx
The erroneous point that Wierwille was attempting to make was that The Way wasn't a religion and, thus, it was superior to other belief systems. (The guy was a pompous azz.)