We have, therefore, two kinds of thinking: directed thinking, and dreaming or fantasy-thinking. The former operates with speech elements for the purpose of communication, and is difficult and exhausting; the latter is effortless, working as it were spontaneously
Jung's foundational formulation establishing directed thinking and fantasy-thinking as the two fundamental modes of cognition, distinguished by their relation to language, effort, and purposive communication.
, Symbols of Transformation, 1952thesis