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 Grove, and Billy Graham, a prominent Southern Baptist Minister. President Donald Trump has called Peale “his pastor” and “one of the greatest speakers” he had ever seen. Fred and Mary Trump, President Trump's parents, traveled to the Marble Collegiate Church in Manhattan with their children to hear Peale's sermons. Trump grew up hearing Peale's teachings from his parents, and Peale officiated his first wedding. Trump credits his survival in 1990 after bankruptcy to Peale's positive thinking teachings. Building on the positive psychology movement, M. Scott Peck, MD warns against the dangers of narcissism and “character disorder” (blaming others for things