“This book is the result of the author's master's thesis at PUC/SP, prepared under my supervision. It was thus with great satisfaction that I saw this volume come to light, in order to reach a wider audience. In fact, the present text presents a content that, despite being rich and instigating, is little known to the reader. In seven chapters plus a Conclusion, the author presents an aspect of Carl Jung's thought, his analysis of alchemy as a manifestation of man's psychological depth. In doing so, she highlights one alchemist in particular, Gerardus Dorneus, who lived in Germany in the early seventeenth century, with his reading of the three alchemical degrees of conjunction, toward religious experience in the Unus Mundus.