This book is aimed at addressing two common misconceptions. The first is that belief in G-d is purely a matter of faith and cannot be supported by rational arguments. The second is that rationality is incompatible with mysticism. The first part of this book argues that it is more rational to believe in G-d than not. The second part argues that instead of rationality being incompatible with mysticism, it ultimately leads to it. In the second part the author draws in particular on the literature of Chabad Hasidic philosophy and the teachings of the Lubavitcher Rebbe. Special attention is devoted