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The term positive psychology dates back at least to 1954, when Maslow's first edition of "Motivation and Personality"  was published with a final chapter titled "Toward a Positive Psychology." In the second edition (1970), he removed that chapter, saying in the preface that "a  positive psychology is at least available today though not very widely."

After combining with existing text it reads:

The term positive psychology dates back at least to 1954, when Maslow's first edition of "Motivation and Personality"  was published with a final chapter titled "Toward a Positive Psychology." In the second edition (1970), he removed that chapter, saying in the preface that "a  positive psychology is at least available today though not very widely." There have been indications that psychologists since the 1950s have been increasingly focused on the promotion of mental health rather than merely treating mental illness.

Further Reading

Lopez, Shane J.; Snyder, C. R. (2009). Oxford Handbook of Positive Psychology. Oxford University Press. ISBN 978-0-19-548724-3

9780195487243