The Tanya is an early work of Hasidic philosophy, by Rabbi Shneur Zalman of Liadi, the founder of Chabad Hasidism, first published in 1796. Its formal title is Likkutei Amarim, but is more commonly known by its opening word, Tanya, which means "it was taught in a beraita". It is composed of five sections that define Hasidic mystical psychology and theology as a handbook for daily spiritual life in Jewish observance. The Tanya is the main work of the Chabad philosophy and the Chabad approach to Hasidic mysticism, as it defines its general interpretation and method. The subsequent extensive library of the Chabad school, authored by successive leaders, builds upon the approach of the Tanya. Chabad differed from "Mainstream Hasidism" in its search for philosophical investigation and intellectual analysis of Hasidic Torah exegesis. This emphasised the mind as the route to internalising Hasidic mystical dveikus, in contrast to general Hasidism's creative enthusiasm in faith.