Jean Piaget tried to reconcile these two viewpoints, which seemed incongruous with the years-long logical study of happiness. In his early years of clinical work, Piaget conducted a remarkable set of tests that clearly connected children's awareness, anxiety, and happiness. Sigmund Freud and Alfred Adler supported Piaget in his belief that children needed to learn the things that adults did not want to learn, such as the critical consciousness of pain, the anguish of frustration, and the dread of uncertainty. Piaget contrasted between the notions that "Happiness" and "Anxiety" are formed from, which originate in childhood, are meaningless, and date back to classical Greece, and "critical consciousness," which is the foundation of modern critical psychology.