The Yoga Vasishta of Valmiki is a very long book of 1845 pages in the English translation, but it is well worth spending the time to read it. If one reads this book slowly, thoughtfully and with the innocence of a child - that means with your ego disengaged - then when you finish the last page and look up from the book, the world will appear to you as a very different place. Your perspective on the world will forever be changed and you will realize (not just understand) that this universe, which you once thought was composed of solid, dense, matter, is literally a collosal dream in the Mind of the Creator; very much like the dreams you have every night.
Reading this book with your ego disengaged is vital. As you read this book you will come across some amazing sections that make the ego very uncomfortable. You will be tempted to throw down the book or at least skip ahead several chapters to a more congenial section. When this happens, remember to let go, slow down and return to your child-like innocence. Do not try to understand complex sections, just let the words flow into your awareness. This is the path to success with the Yoga Vasishta!