Jung examines the quaternary as the structure of psychological completeness—the four-fold pattern that appears in mandalas, representing the integration of the four psychological functions and the completion missing from the Christian trinity.
Four-Fold Mandala
The Four Psychological Functions
Thinking
Rational analysis, logic, and understanding through concepts and ideas.
Feeling
Value judgments, emotional assessment, and meaning through relationships.
Sensation
Perception through the senses, concrete reality, and present experience.
Intuition
Perception of possibilities, unconscious patterns, and future potential.