Leibniz defends teleology or purposive activity against the overly mechanical worldview of Thomas Hobbes, and develops an idea of spontaneity as self-originating action irreducible to mere mechanistic reaction. He links free activity with justice as the enabling conditions for the exercise of freedom, and with the progressive deployment of individual and collective powers. He thus sets the agenda for subsequent idealism, which reconfigures the idea of spontaneity and reflects on the harmonisation of diverse individual efforts as a problem of ongoing juridical reform