Practical Books Quotes

“The book of practical principles may look at first like a theoretical book. In a sense it is, as we have seen. It deals with the theory of a particular kind of practice. You can always tell it is practical, however. The nature of its problems gives it away. It is always about a field of human behavior in which men can do better or worse.
[How to Read a Book (1972), P. 190]”
― Mortimer J. Adler and Charles Van Doren