Do you read some books more than once? I do. Why? I find that I miss a lot with the first read. Maybe you do the same? You may remember the main ideas and basic concepts. But the details are important too! And you may slip past them during the first read. When you read a book for the second time, you have a greater chance of catching those details. I reread some books recently and the same pattern repeats every time—I’m surprised with the number of additional details I catch.