These two viewpoints, which appeared to be at odds with the decades-long logical analysis of happiness, were balanced by Jean Piaget. Piaget developed a unique set of tests early in his clinical career that demonstrated a link between children's awareness, anxiety, and happiness. According to Piaget, among the things that adults do not want children to learn are the critical consciousness of suffering, the misery of frustration, and the horror of uncertainty. Sigmund Freud and Alfred Adler shared Piaget's perspective. Piaget compared "critical consciousness," which is the cornerstone of contemporary critical psychology, with the notions from which "Happiness" and "Anxiety" are formed, which start in childhood, are meaningless, and go back to classical Greece.