Saint Hildegard of Bingen (1098-1179), the most famous German writer of the Middle Ages, has long been regarded as the first female physician and natural scientist in Germany. This book presents a classic argument that dispels these false clichés and demonstrates that Hildegard neither conducted experiments herself nor processed scientific knowledge from others. Hildegard received all her insights from God; she was allowed to see them in a "living light," a sort of screen where she could read the mysteries of nature and the supernatural, which she then dictated in Latin to the monk Volmar. What is exciting is not the extraordinary nature of her revelations, but the fact that Hildegard's medicine is also valid, as Dr. Hertzka, the author of this work, has already described in his first book "So Heals God - The Medicine of Saint Hildegard.".