One of the foremost spokesmen for the Third Force movement in psychology, Abraham H. Maslow here articulates one of his prominent theses: the "e;religious"e; experience is a rightful subject for scientific investigation and speculation and, conversely, the "e;scientific community"e; 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 "e;peak-experiences"e; reached by healthy, fully functioning people.