We may hold then, a priori, that this progressional principle exists; that it exists not more in the man than around him; that it requires an atmosphere in which to live, as life in the body requires an atmosphere which is its vital breath, and that this atmosphere is generated only by the contact of man with man. Under analysis this social atmosphere appears to be composed of two opposing principles--good and evil--which, like attraction and repulsion, or positive and negative electricity, underlie all activities. One is as essential to progress as the other; either, in excess or disproportionately administered, like an excess of oxygen or of hydrogen in the air, becomes pernicious, engenders social disruptions and decay which continue until the equilibrium is restored; yet all the while with the progress of humanity the good increases while the evil diminishes. Every impulse incident to humanity is born of the union of these two opposing principles. For example, as I have said, and will attempt more fully to show further on, association is the first requisite of progress. But what is to bring about association? Naked nomads will not voluntarily yield up their freedom, quit their wanderings, hold conventions and pass resolutions concerning the greatest good to the greatest number; patriotism, love, benevolence, brotherly kindness, will not bring savage men together; extrinsic force must be employed, an iron hand must be laid upon them which will compel them to unite, else there can be no civilization; and to accomplish this first great good to man,--to compel mankind to take the initial step toward the amelioration of their condition,--it is ordained that an evil, or what to us of these latter times is surely an evil, come forward,--and that evil is War. [Sidenote: EVIL AS A STIMULANT OF PROGRESS.]