 While an atheist describes the unity as “freed from empirical filling”, a religious person might describe it as “God” or “the Divine”.In “Mysticism and Philosophy”, one of Stace’s key questions is whether there are a set of common characteristics to all mystical experiences.Based on the study of religious texts, which he took as phenomenological descriptions of personal experiences, and excluding occult phenomena, visions, and voices, Stace distinguished two types of mystical experience, namely extrovertive and introvertive mysticism.