A home without a library lacks diversity of voices, opinions and world views. When you read a book, you enter another person's perspective. And because a reader can put the book down and think about what the author has said, a good reader enters a dialogue with the author or the characters created by the author. One can reread passages and linger over thoughts or ideas or savor the deliciousness of the language.
Books encourage thinking.
A reader must create images from the words the author has supplied, must imagine the events described, must track the plot or the logic of the writer and must visualize the main characters in the mind's eye. The book is in your hands. You can return to passages if there is something you don't understand. The book is in your hands and so, too, is the right to read. There are many in our nation who would restrict this right.