this little book is a solid fundamental ideas, often forgotten and yet essential to each and every one of us. It does not apply to revenue as is but a philosophical and spiritual guide (careful! Do not confuse spiritual and religious, they are poles apart notions) to advance and understand, act and progress. After this book, you will need to turn to more philosophy and see why this discipline is not enough at the center of our lives. Go ahead without restraint and without bias. Open yourself, for your enjoyment. So your journey begins.