The Power of Positive Thinking Happiness," published in 1950, and "Inspiring Messages for Daily Living", published in 1955. "The Power of Positive Thinking" appeared at a time when Christian church attendance was drastically increasing, national views of spirituality, individuality, and religion were shifting, and the Cold War was a growing concern for many Americans. These factors, as well as Peale's growing popularity as a motivational public figure and the book's clear prose, propelled "The Power of Positive Thinking" into a self-help book still popular today. Peale begins by stating ten rules for “overcoming inadequacy attitudes and learning to practice faith”. The rules include the following:
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