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 because most obstacles are “mental in character”. Habitual worrying is the next obstacle to overcome through emptying the mind and positive affirmations. Peale then states that asking God for help can solve one's personal problems and physically and emotionally heal them. In chapter twelve, Peale states that letting go of anger and embracing a sense of calm can help with physical illnesses, such as eczema. Next, Peale states that letting positive thoughts in can change one's outlook on life drastically and that practicing relaxation through God's help will lead to a content life. Chapter fifteen gives concrete examples on how