Is it possible to consolidate the content of 1500 books into one? The author of this book, Master Ryuho Okawa is the founder of Happy Science, a religious organization in Japan which has members in more than 100 countries. Since 1985, within a span of around 30 years, he has published more than 1500 books, an astounding number in countries all over the world and established the fundamental teachings of Happy Science. In this book, the author teaches us what the basic teachings of Happy Science are among the vast amount of teachings he has already given us. However, if one reaches for this book in the hope to read a summary of the 1500 books, you may realize something much better than expected. In the book, Master Ryuho Okawa says the following: “If the teachings are summarized too rigidly now, there is the possibility that I may become unable to teach the Laws in the future, so I intend to teach what I think is important at any particular time. In this way, I will keep on saying what I have to say without being bound by what I have taught in the past. Although I have been giving lectures for nearly 30 years now, my mission is still not complete. If I continue to do this, I think that our teaching will continue to evolve.” In this book, it can be said that the author has given us the basic teachings of Happy Science that are continuously evolving and developing, in light of the vast amount of teachings from the 1500 books, but from a completely different angle using new words. We will introduce a part of the book; “Whatever happens, be determined to achieve your mission,” “The Life of Socrates makes us think about what Truth is,” “The Dharma of the Right Mind is a ‘weapon’ to draw light from Heaven,” and “Live in readiness to die for the Truth and for your faith.” When you finish reading this book, three key words, Truth, Faith and Mission that are indispensible to achieve happiness will be left in your heart, and you are bound to discover yourself filled with the wish to live a life of Truth.