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 also condemned Peale's methods in his book, "Authentic Happiness". He writes that, “positive thinking often involves trying to believe upbeat statements such as 'Every day, in every way, I’m getting better and better,' in the absence of evidence, or even in the face of contrary evidence.” Seligman continues his critique saying, “if you can manage the feat of actually believing these sorts of statements, more power to you. Many educated people, trained in skeptical thinking, cannot manage this kind of boosterism.” Similarly, Donald Meyer, in his book "The Positive Thinkers", critiques the effectiveness of Peale's techniques saying that Peale always