A concordance is a list of words used in a book or by an author. The listings are usually given with citations to the appropriate passages. In this concordance, however, you do not have to go to a separate list. When reading the work of major writers, be aware that many were produced in cultures and circumstances very different from your own. Some readers find these differences to be obstacles and frustrations. What it is important to keep in mind is that it is possible to improve your understanding of any work by careful attention and interpretation. One reason this is worth doing, is that the practice of understanding others requires you to recognize and act upon your own assumptions. That is will be an advance in your own growth of self-knowledge, which is a perennial aim of philosophy. Stick with it! When you find yourself becoming frustrated or angry with a writer, it is likely that his/her words have struck a sensitive spot in your system of beliefs.