Book excerpt: KNOWLEDGE: Do we obtain reliable knowledge about the world from ongoing supernatural revelation, or from scientific investigation? NATURE: Is it preferable to perceive God as working through nature, or through supernatural miracles? SUPERNATURAL ENTITIES: Are we surrounded by all kinds of supernatural forces and entities, such as endless conscious angels, demons and the Evil Eye? MITZVOT: Do the commandments function solely to change our thoughts and behavior, or primarily to manipulate mystical forces? TORAH: Is Torah a Divine guide for life, or is it also a metaphysical blueprint for existence with all kinds of supernatural qualities? Rationalism vs. Mysticism is a thorough study of how these questions were answered very differently by various rabbinic scholars over history, reflecting two fundamentally different views of the nature of Judaism. It will profoundly deepen your understanding of Judaism and many of the intellectual conflicts that have arisen in Jewish history.