In the preface to his Grundlegung zur Metaphysik der Sitten, Groundwork of the Metaphysics of Morals, of 1785, Immanuel Kant wrote that all trades, crafts and arts have gained from the division of labor. No one does everything. Each person restricts himself to one kind of work, so as to do it with the greatest perfection and more ease. Kant goes on: Wo die Arbeiten so nicht unterschieden und verteilt werden, wo jeder ein Tausendkünstler ist, da liegen die Gewerbe noch in der größten Barbarei. Where work is not distinguished and divided in this way, where everyone is a thousand-artist, the trades still lie in the greatest barbarism. Tausendkünstler is the German word for a jack of all trades.