The GENERAL CONTEXT of such use is:
the ruling ideas: The ruling ideas, in every age, are the ideas of the ruling class, but also that the ruling ideas themselves reinforce the rule of that class, and that they succeed in doing so by establishing themselves as 'legitimate', that is, by concealing their basis in the (economic and political) power of the ruling class.
Also see Father Jerome's BLOG, for info about his latest Book,
"God, Lucifer and You! A ScienceBook of Quantum Physics and Reality, for 5 year old Kids and Adults!"