This may be seen in his treatment of law as a whole (Book II , chap. VI ), which deserves very careful attention. He defines laws as “acts of the general will,” and, agreeing with Montesquieu in making law the “condition of civil association,” goes beyond him only in tracing it more definitely to its origin in an act of will. The Social Contract renders law necessary, and at the same time makes it quite clear that laws can proceed only from the body of citizens who have constituted the State. “Doubtless,” says Rousseau, “there is a universal justice emanating from reason alone; but this justice, to be admitted among us, must be mutual. Humbly speaking, in default of natural sanctions, the laws of justice are ineffective among men.” Of the law which set up among men this reign of mutual justice the General Will is the source.