One of the things that gives hope and courage to men and women who study the structure of the mind, is the fact that the brain tissues may be altered with much greater ease and to a far greater extent than other bodily tissues. Every thought wears a path in the tissues of the brain. Constant thinking builds up the brain at a marvelous rate.

In order to indicate to the salesperson the great scope of psychology in selling, here is a list of some of the important topics in mind-study.