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