Which body humor is believed to be associated with courage and energy?

The belief that blood is associated with courage and energy is rooted in ancient medical theories such as the humoral theory, which posited that health and temperament were governed by four bodily fluids or "humors." Blood was typically linked to the traits of being lively, sociable, and energetic, as it was thought to invigorate and provide warmth. Those considered sanguine, or blood-dominant individuals, were believed to exhibit an enthusiastic and positive disposition, often associated with courage.

Understanding this historical perspective helps to frame blood not just as a physical substance, but as a symbolic representation of vitality and assertiveness. Such associations have persisted in cultural narratives, allowing blood to maintain its connotation of life and fortitude throughout history, which is why it is seen as being linked to courage and energy.