Tanya
Chabad Chassidus is a philosophical form of Jewish mysicism which teaches an all-embracing world outlook and way of life. It sees the Jew's central purpose as a unifying link between the Creator and His world.
Written by the Alter Rebbe, the founder of Chabad, Tanya is the central text of Chabad Chassidus. It shows the reader a path to realizing their purpose and developing a deeper relationship with G-d.