The Power of Positive Thinking believe and live successfully.” Peale's work came under criticism from various mental health experts, theologians, and academics. One general criticism against Peale's book was the lack of verified sources. "The Power of Positive Thinking" includes many personal anecdotes that the reader has no way of validating. The book includes stories about “a business executive”, “a man, an alcoholic”, “a famous trapeze artist”, “a friend of [Peale’s], a midwestern businessman”, and other unnamed individuals which cannot be verified from the information Peale presents with each anecdote. R. C. Murphy, a prominent psychiatrist based out of Tacoma, Washington, addresses another criticism of
The Power of Positive Thinking Peale's teachings “lead to failure and disillusionment, and not only boomerang back against people, but often prejudice them against effective therapy." Another criticism is that Peale's philosophy is not accomplished through his techniques presented. R. C. Murphy writes that Peale's teachings “endorse the cruelties which men commit against each other” which encourages readers to “give up [their] strivings and feel free to hate as much as [they] like”. Murphy argues that by teaching others to destroy all negativity, Peale is, in fact, fostering negativity and aggression. Harvard scholar Donald Meyer presents a similar criticism in his article "Confidence Man" written