The mass of absolutely illiterate, of feeble-minded, grossly neurotic, undernourished and frustrated individuals, is very considerable, much more considerable there is reason to think than we generally suppose. Thus a wide popular appeal circulated among persons who are mentally children or barbarians, people whose lives are a morass of entanglements, people whose vitality is exhausted, shut-in people, and people whose experience has comprehended no factor of the problem under discussion. (p. 71)