In Federalist 45, Madison argues that the Union as outlined in the Constitution is necessary to the people's happiness and that the balance of power between the states and the national government will support the greatest happiness for the people. He argues that the primary purpose of government, and hence of the Constitution, is the people's happiness, and therefore only a government that promotes the people's happiness is legitimate, writing, "Were the plan of the Convention adverse to the public happiness, my voice would be, reject the plan. Were the Union itself inconsistent with the public happiness, it would be, abolish the Union".