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All human activity springs from two sources: impulse and desire. The part played by desire has always been sufficiently recognized. When men find themselves not fully contented, and not able instantly to procure what will cause content, imagination brings before their minds the thought of things which they believe would make them happy. All desire involves an interval of time between the consciousness of a need and the opportunity for satisfying it. The acts inspired by desire may be in themselves painful, the time before satisfaction can be achieved may be very long, the object desired may be something outside our own lives, and even after our own death. Will, as a directing force, consists mainly in following desires for more or less distant objects, in spite of the painfulness of the acts involved and the solicitations of incompatible but more immediate desires and impulses. All this is familiar, and political philosophy hitherto has been almost entirely based upon desire as the source of human actions.
