The German Benedictine abbess, St. Hildegard von Bingen (1098-1179) was named a mystic in the European Middle Ages. She had her mystical visions when she was a child. Around forty-three, she started to write her first theological book, Scivias. Pope Eugenius III (1145-1153) acknowledged her mystical visions, and supported her to talk about them publically and to write them down. "Gazing" and "Hearing" were for St. Hildegard von Bingen the paths toward Holiness. She believed that human beings possess bodily eyes as well as "eyes of the soul" (Inner eyes). In her experience of mystical visions, the "inner eyes" were especially needed to comprehend the mystery of Faith. The "inner eyes" were the prominent element to guide human beings beyond their bodily feeling, and to be connected with God. In the twenty-six visions of Scivias the prophetic call to St. Hildegard von Bingen is documented, described and painted. The book was finished between 1141 and 1151 and is highly-valued, because it was her first book and the foundation of her other theological works. It presents Hildegard's understanding of the Bible and her role as a transmitter of the grace and redemption of God seen through her mystical visions and description of them. This paper focuses on the first three mystical visions in the first part of Scivias and explores her mystical experience and the hierophony which she perceived through "gazing".