The phrase "ruling passion" refers to a deep-seated and dominant desire that drives our actions and decisions. Alternative words for the term include "driving force," "preoccupation," "obsession," "fixation," or "compulsion." The concept of having a ruling passion dates back to ancient Greece, where it was seen as a guiding principle for human behavior. In modern times, the idea has been used to describe individuals who are deeply committed to a particular cause, hobby, or profession. While a ruling passion can be a positive and motivating force, it can also lead to tunnel vision and a lack of balance in one's life.