The Devil is the card of addictions, obsessions, sex, temptation and unhealthy patterns. It is also associated with money, fame and material possessions. The Four of Cups is related to routine, stagnation, dissatisfaction, boredom. Sometimes it points to an opportunity that goes unnoticed, while we focus on all the unpleasant things we experience. The combination of the Devil and the Four of Cups points to an addiction or obsession that has become a habit, a situation we feel there's no escape.
To understand the elemental relationships between the cards, we should always take into account their actual meaning. The elements of these cards are Earth (Devil) and Water (Four of Cups). Both elements are passive and strengthen each other. As a result, we should expect that the qualities of each card will be emphasized. The Devil is a strong force that keeps us captive, controlled, addicted, usually in devious ways and the Four of Cups is an energy that shows stagnation. This is a combination that does not allow for change and it will take much effort and discipline to break free.