This document discusses two modes of cognitive reasoning: rational and intuitive thought. Rational thought is slow, effortful, controlled, and conscious, while intuitive thought is fast, effortless, and unconscious. It notes that rational thinking is language-based and unique to humans, while intuition relies on psychological constraints and the environment. The document explores how both rational and intuitive thinking can be used to understand possibilities, make evaluations and judgments, and find renewed energy and perspective when facing problems. It also discusses operationalizing and balancing rational and intuitive thinking on both individual and collective levels.