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. As a consequence, Chabad Hasidic writings are typically characterised by their systematic intellectual structure, while other classic texts of general Hasidic mysticism are usually more compiled or anecdotal in nature.