The Power of Positive Thinking by Norman Vincent Peale

“BELIEVE IN YOURSELF! Have faith in your abilities! Without a humble but reasonable confidence in your own powers you cannot be successful or happy. But with sound self-confidence you can succeed. A sense of inferiority and inadequacy interferes with the attainment of your hopes, but self-confidence leads to self-realization and successful achievement.”
“The greatest secret for eliminating the inferiority complex, which is another term for deep and profound self-doubt, is to fill your mind to overflowing with faith. Develop a tremendous faith in God and that will give you a humble yet soundly realistic faith in yourself.”
“The way to happiness: Keep your heart free from hate, your mind from worry. Live simply, expect little, give much. Scatter sunshine, forget self, think of others. Try this for a week and you will be surprised.”