Why was I born in this world? Why do I live? Where does the motivation for life come from? Do people live to eat or eat to live? What is the meaning of life? Many people of all ages have asked numerous questions about the essence of life, and there have been countless answers, but I have yet to hear an acceptable answer. Naturally, it is difficult to expect answers about human life from people who lack an understanding of life and the nature of humans. In the book 『Greedy Soul』 published before this, I mentioned the birth of life and the growth of the human brain, and I believe that there is a specific natural force that causes greed to arise in humans. For now, I am the only one who advocates this theory, but I do not doubt that it will become common sense for everyone in the future. In this book, I would like to talk about why living creatures, including humans, have the motivation to live and what the meaning of life is for humans. Grass and trees are not born because they want to be born, nor do they grow because they want to, and insects and animals are not born because they want to, nor do they live with the will to live. Likewise, no human being is born because they want to be born, grows because they want to grow, or lives because they want to live. Just like all animals that instinctively avoid death and search for food, humans also try hard to avoid the risk of death and starvation. Life springs up with the power of nature, like plants breaking through cracks in rough stones. Animals that evolved from plants also maintain life with the power of nature that comes from inside, and this can only be seen as a strong desire for life. This is because all living things on Earth are governed by the same natural principles.