The Power of Positive Thinking in 1955. Meyer writes that "The Power of Positive Thinking" provides partial awareness to the limitations of the readers but does not supply the necessary self-confidence to overcome those limitations. He proceeds to compare Peale to a con man saying that the problem with Peale lies in the “paltriness of the confidence he preached. He did not really try to fool you into thinking you could do much, or be much, or live much. He did not make you aware of greater heights any more than of greater abysses.” Psychologist Martin Seligman, former APA president and founder of positive psychology,
Positive adult development and Langer (1990). Four postformal adult stages of development beyond the formal stage have been discovered in a wide variety of domains. The total number of stages across the life span now stands at 15. Periods and Seasons have been described. For critical discussion of term postformal thinking, see Kallio (2011). She claims that highest forms of adult cognitive development (as part of adult positive development) can be called as integrative thinking (i.e. integrating several different psychological domains as emotions, cognition etc.). A number of edited books were written on the topic of positive adult development in the 1990s (Commons,