As a Man Thinketh says our thoughts set the course our life, not our circumstances. James Allen says thoughts are seeds for actions, so our mind is a garden where we must cultivate the right seeds. This short, inspiring book still influences many modern self-help teachers.
Meditations shows how to become more self disciplined, stop caring what people think, and withstand life's emotional storms. Marcus Aurelius was a powerful Roman emperor and great Stoic philosopher. He wrote down all these thoughts in a private journal to himself.
Think and Grow Rich is a classic self help book, based on Napoleon Hill interviewing 500 millionaires including Henry Ford and Thomas Edison. He says the formula for riches is first having a burning desire for them, then following a definite plan and having faith that plan will succeed.
Man's Search for Meaning was written after Viktor Frankl survived the concentration camps of WW2. He noticed that his fellow prisoners who could find purpose and meaning in their suffering found the strength to survive, while others perished. This book is also a guide to finding meaning in your life.