Mentalism is not to the taste of most people. It does violence to their common sense. It is too little known, hence has few followers. There are two kinds of truth: one is the truth of appearances, and the other is hidden deep down. The first is easy to understand; the other requires much work on one's own mind to get it sharp enough to recognize what is so elusive.
-- Notebooks Category 21: Mentalism > Chapter 4: The Challenge of Mentalism > # 79