"本は手の中の光の玉であるべきだ。"

Simplified Meaning:

A good book can be like a bright light that makes the world clearer and happier. Imagine being in a dark room and holding a flashlight. That flashlight helps you see things around you that you couldn't see before. Similarly, a meaningful book helps you understand new ideas, learn important lessons, or see life from a new perspective. For example, think about a time when you were confused or sad. Reading a book that talks about characters going through similar things can make you feel less alone. It's as if the book is shining a light on your feelings, helping you to understand them better and find comfort. A book like this can inspire you, give you hope, or even motivate you to make positive changes in your own life. So, when you find a book that feels like a little ball of light, it means it's doing something special for you. It's opening up your mind, touching your heart, and maybe even making your world a bit brighter.