It has been found that by turning the Principle of Power into any section of the brain, with the will and purpose to develop a particular talent, the brain cells may be multiplied indefinitely.  

Any faculty, power, or talent you possess, no matter how small or rudimentary, may be increased; you can multiply the brain cells in this particular area until it acts as powerfully as you wish. It is true that you can act most easily through those faculties that are now most largely developed; you can do, with the least effort, the things which “come naturally or you enjoy”; but it is also true that if you will make the necessary effort you can develop any talent. You can do what you desire to do and become what you want to be. When you fix upon some ideal and proceed as hereinafter directed, all the power of your being is turned into the faculties required in the realization of that ideal; The proper use of the mind of man will build a brain capable of doing what the mind wants to do.  

The brain does not make the man; the man makes the brain.