Two motives grow out of the practical motives of combat, which we may assume to have been the original motives. These are both emotional rather than instinctive. Fear and anger, that is to say, become more or less detached motives for attack. Fear is increased with the increase of intelligence up to a certain point at least--with the increase of the capacity for understanding danger, and of the powers of man to become dangerous. All the experience of combat engenders anger and hatred, and these moods of hatred toward enemies are cumulative, absorb all the detached motives and feelings of antagonism between groups, preserve and give continuity to the memories of conflict, and so produce among groups the fear and hate motive. The feeling of fear arouses the motive of aggression, and the feeling of anger; and these in turn generate more fear, until both the moods of anger and fear and a perpetual state of animosity and warfare are induced among contending groups. Thus out of primitive motives of combat the feud as a more generalized and psychical antagonism is produced, and these states are possible because of the powers of generalization in man which extend to the emotions and make possible the formation of deep moods. In another direction, also, the practical motives tend to be superseded by more abstract and more subjective motives. Both in the fear and anger reactions and in the motive that originates in the sexual impulse--display of males, and combat with reference to females--consciousness of prowess for its own sake, and the display of it in order to intimidate the enemy, arise. Into this motive of war there enter all the antagonisms that come from self-consciousness, the whole force of the diathesis of developing sexuality, with its jealousy and cruelty, and tendencies to perversion. The force of this motive of prowess must at some period of development have become very great. It extends out into a love of combat for its own sake, reenforces other motives, and issues in the more abstract motives of honor and power that we see playing such a great part in modern warfare.