The book is useful to a person, but more useful is the research of the one who reads the book. The author is grateful to everyone))) “This world is only spiritual. Since you identify yourself with the physical body, you speak of this world as physical and the other as spiritual Whereas what exists is only spiritual, if you realize yourself as Spirit, you will see that this world is only spiritual and not physical. In a dream you create a dream body for yourself and act with this dream body. the very fake happens in the waking state. At this time you think that you are this body, and not the dream body. But your dream proves that this waking body is false. Therefore, look, none of these bodies are real. each of them is real only at one time and false at all other periods. That which is real must always be real. Your true nature is that infinite spirit,” said Sri Ramana Maharshi.