Roger Kimball reviews "The Opium of the Intellectuals". 

The primary target of Aron’s polemic was fanaticism. But he also recognized that the defeat of fanaticism often leads to a contrary spiritual sickness, indifference. Both are expressions of the ultimate enemy, nihilism. Skepticism, Aron wrote, is useful or harmful depending on which is more to be feared at the moment: fanaticism or apathy. The intervening faculty that orients us appropriately is practical wisdom, prudence, “the god” (Aron quotes Burke) “of this lower world.”

I read part of the book after Jonah Goldberg mentioned it at The Corner a few years ago.  I remember it was hard to get (it took a while for my library to get it on inter-library loan).  I liked it but never finished.  It's an English translation of a French work on philosophy/sociology and I found it heavy going.  I just couldn't put in the time.