Proverbs 22:17-21 gives the importance of reading and studying the best books, especially the Word of God.
“Incline your ear and hear the words of the wise, and apply your mind to my knowledge; for it will be pleasant if you keep them within you, that they may be ready on your lips. So that your trust may be in the Lord, I have taught you today, even you. Have I not written to you excellent things of counsels and knowledge, to make you know the certainty of the words of truth that you may correctly answer him who sent you?” (Proverbs 22:17-21, nasb)
C. S. Lewis wrote to a friend (as published in The Collected Letters of C. S. Lewis):
“I myself always index a good book when I read it for the first time noting (a) Linguistic phenomena. (b) Good & bad passages. (c) Customs: meal times, social classes, what they read, etc. (d) Moral ideas. All this reading, though dedicated ad Dei gloriam [to the glory of God] in the long run must not be infected by any immediate theological, ethical, or philosophic reference. You first job is simply the reception of all this work with your imagination & emotions. Each book is to be read for the purpose the author meant it to be read for: the story as a story … .”