A book, too, can be a star, a living fire to lighten the darkness, leading out into the expanding universe.

This quote is saying that a book can provide knowledge and illumination. It can provide an understanding of life and the world around us, and give us the opportunity to explore different ideas and concepts and travel through new experiences. A book can be a source of encouragement and hope, helping us to see beyond the darkness of our own lives and reach for the stars.