" It is relatively easy to think of and be conscious of physical acts. It is much harder to think of mental acts, as the beginning analytical reader must do; in a sense, he is thinking about his own thoughts. Most of us are unaccustomed to doing this. Nevertheless, it can be done, and a person who does it cannot help learning to read much better.
(P. 55) "

― Mortimer J. Adler, Charles Van Doren, , How to Read a Book: The Classic Guide to Intelligent Reading