Narcissistic personality disorder causes people to obsess about achieving power.
 Regarding maladaptation, ubiquity, and stability as the three main symptoms of behavioral pathology, he distinguished nine clusters of psychopaths: cycloids (including constitutionally depressive, constitutionally excitable, cyclothymics, and emotionally labile), asthenics (including psychasthenics), schizoids (including dreamers), paranoiacs (including fanatics), epileptoids, hysterical personalities (including pathological liars), unstable psychopaths, antisocial psychopaths, and constitutionally stupid
 affectivity, arousal, impulse control, ways of perceiving and thinking, and style of relating to others;The abnormal behavior pattern is enduring, of long standing, and not limited to episodes of mental illness;The abnormal behavior pattern is pervasive and clearly maladaptive to a broad range of personal and social situations;The above manifestations always appear during childhood or adolescence and continue into adulthood;The disorder leads to considerable personal distress but this may only become apparent late in its course;The disorder is usually, but not invariably, associated with significant problems in occupational and social performance

