Think and Grow Rich is a self help book written by Napoleon Hill and published in 1937 during the Great Depression.
This book had to inspire present New Age thinkers, and for that reason I am attaching a link to this book below. The book speaks mostly of attaining wealth, and I believe that all of us would be in agreement that money and material things are essential for maintaining life, but that the greatest of all wealth resides in love, nature, relationships with family and friends, and peace within ourselves. Napoleon Hill is so ahead of his time however you can see where his principles of success would apply to these ideals as well.
If you have read and enjoyed “The Secret” then you will enjoy this book as well, as it takes you deeper into the same philosophies.