John Holt suggests students to read the parts that excite them. "When you read for knowledge. And you are humiliated. You can never pick them."
He gives an interesting analogy.
Mark Twain once said that a cat that sat on a hot stove lid would never sit on one again-but it would never sit on a cold one either. As true of children as of cat. If they, so to speak, sit on a hot book a few times, if books cause them humiliation and pain, they are likely to decide that the safest thing to do is to leave all books alone.