There seems to be a strife between opposing forces at the basis of all things, a strife in which a perfect balance is never attained, or life would cease. The worlds are kept on their courses by such opposing forces, the perfect equilibrium never being found, and so the vitalising movement is kept up. States are held together on the same principle, no State seeming able to preserve a balance for long; new forces arise, the balance is upset, and the State totters until a new equilibrium has been found.