Fear and suspicion cause aggressive wars even when the fear may be, in all reason, groundless. There is no more dangerous individual in the community than the one having delusions of persecution, for his mania is naturally homicidal. So with nations. Fear is a treacherous and deceptive passion. We may see this fear, if we choose to look for it, even in the ecstatic mood of war and the spiritual exaltation of Germany during the first few weeks or months of the war. This exaltation was in part a reaction of fear--or a reaction from fear. Germany was afraid, feared for her existence, and the exaltation was in part a sense of taking a terrible plunge into the depths of fate. Germany was afraid of Russia and afraid of England, and that fear had to be overcome, because the presence of the fear itself was a matter of life or death. But the exaltation did not merely succeed the fear. It contained it. And why should Germany, even with all her preparedness and her resources not be afraid? An inherited fear is not so easily exorcised. Germany arrayed against all Russia and all the British Empire, Germany no larger than our Texas experienced a state of exaltation, overcoming fear. But it required something more than courage to overcome the fear; and that other element was mysticism. To the sense of throwing all into the hands of fate which, by all physical signs must be adverse, was added, as a compensating element, Germany's mystical belief in her security as a chosen nation. Fear, by its intensity and depth may, like physical pain, become ecstatic and thus be overcome. _Hatred_ Hatred must be considered both as a cause of war, and as an element in the war moods. Many authors have called hatred one of the deepest roots of war. This hatred between nations even Freud says is mysterious. But Pfister, referring to Adler's theory, says that war must be understood precisely as we understand enmity among individuals. A sense of inferiority is insulted, and thus aggressive feelings are aroused. The nation, like the individual, is spurred on to make good its claim to greatness. It is a feeling of jealousy based upon a sense of inferiority that causes hatred. O'Ryan and Anderson (5), military writers, say there are two causes of war: those based upon an assumed necessity, and those based upon hatred. Nusbaum (86) also finds two causes of war, the expansion impulse and the egoism of species, which leads to long enmities.