The Power of Positive Thinking of followers testified that Peale’s message changed their lives for the better and represented the best combination of faith and pragmatism.” This is evidenced by the popularity of Peale's book, which sold more than 5 million copies worldwide and was eventually translated into over 40 languages. In addition, Peale was close friends with American presidents Eisenhower and Nixon, both of which highly regarded his positive thinking teachings. Countless others accredited "The Power of Positive Thinking" for their success in overcoming obstacles including George Foster, of the Cincinnati Reds, Rev. Robert Schuller, founder and pastor of the Crystal Cathedral in Garden
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