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 with how to obtain consistent energy, saying that “God is the source of all energy”. The mind controls how the body feels; thus, letting go of negative energy and emotions will give infinite energy through God. Next, Peale speaks of the healing power of prayer, and how it will heal physical and emotional problems that arise from negative circumstances. In chapters five and six, Peale asserts that happiness is created by choice and that worrying only inhibits it and should be stopped. The next step in thinking positively is to always believe in success and not to believe in defeat