This document is an introduction and preface to Abraham Maslow's book "Religions, Values, and Peak Experiences" which examines core religious or transcendent experiences. The introduction provides background on increasing communication between religions and sciences. Maslow believes these experiences are valid psychological events rather than direct revelations from God. The preface warns that organized religions can become enemies of religious experience by becoming overly behavioral or legalistic. It also warns that mystics can become selfish in only seeking peak experiences or escalating behaviors to trigger them. Overall, the document introduces Maslow's perspective on integrating religious experience and science.