The Power of Positive Thinking Happiness," published in 1950, and "Inspiring Messages for Daily Living", published in 1955. "The Power of Positive Thinking" appeared at a time when Christian church attendance was drastically increasing, national views of spirituality, individuality, and religion were shifting, and the Cold War was a growing concern for many Americans. These factors, as well as Peale's growing popularity as a motivational public figure and the book's clear prose, propelled "The Power of Positive Thinking" into a self-help book still popular today. Peale begins by stating ten rules for “overcoming inadequacy attitudes and learning to practice faith”. The rules include the following:
The Power of Positive Thinking psychic fragments, then ideas like 'mind-drainage' follow. So does the reliance on self-hypnosis, which is the cornerstone of Mr. Peale's philosophy.” Murphy concludes that Peale's techniques for positive thinking relate too closely to hypnosis and are inadequate for the readers’ needs of self-improvement. Albert Ellis, an influential psychologist of the 20th century and the founder of cognitive therapy, also criticized Peale's techniques for their similarities with hypnotism. He compared the techniques presented with those of the hypnotist Émile Coué and asserted that the repeated use of these hypnotic techniques could lead to significant mental health problems. Ellis stated that eventually