When you finish reading a book (and while you’re in the process of writing, too), document what you’re learning. Write down the thoughts that the words provoke in you. In this way, you’ll force yourself to synthesize material. And while you’re at it, make these notes public. You’ll have the added pressure of making them understandable and polished for others to get value from them, too. If you read a book and put it down immediately, you’re not learning, you’re skimming. Just like a teacher, a book is only a tool you use to teach yourself. Without your willingness to put in the extra work and thinking, you will achieve nothing.