Knowledge of facts is important. Knowledge of truth is essential. Yet our Lord's concern goes beyond mere head knowledge. He wants us not only to know the truth but also to obey the truth. He wants us to live the truth, practice the truth, and be conformed to and transformed by that truth.
I like books that aren't just lovely but that have memories in themselves. Just like playing a song, picking up a book again that has memories can take you back to another place or another time.