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 enhanced by 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.