Did you know that a car engine has 14,000 parts that work together to make a car run? 14,000! As expensive and complex as an engine is, without oil—an extremely simple and inexpensive thing—an engine will lock up and die because of heat and friction. Similar to a car engine without oil, relationships are prone to friction and damage. In order to keep unity and not damage relationships, we need humility. Humility is the oil to healthy relationships.