For almost a century, mothers have read the inspiring story of "The Little Engine That Could" to their children. Mothers may not realize the powerful message of confidence and willpower illustrated by the little blue engine struggling to climb a mountain and deliver a train filled with toys for the children on the other side. But their children do, turning the phrase “I think I can” into a personal mantra. A Methodist clergyman reinforced a similar theme in his best-selling "The Power of Positive Thinking", which was published in 1952 and is still popular today. Today, the message of positivity is being carried around the world by such luminaries as a life coach and author Tony Robbins and his message of success.