ruling idea, n.All

Ruling idea (n.) of ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠an age are the ideas of its ruling class, and a selective critique may keep some and filter out the rest.