One of the foremost spokesmen for the Third Force movement in psychology, Abraham H. Maslow here articulates one of his prominent theses: the &quote;religious&quote; experience is a rightful subject for scientific investigation and speculation and, conversely, the &quote;scientific community&quote; will see its work enhanced by acknowledging and studying the species-wide need for spiritual expression which, in so many forms, is at the heart of &quote;peak-experiences&quote; reached by healthy, fully functioning people.