Nazi ideology, with racial purity as its central theme, was extended into every aspect and level of society. Schoolbooks were rewritten and teachers took an oath of loyalty to Adolf Hitler. The 'racial sciences' exalted the Germans as the master race and Jews as the epitome of evil. All institutions of society became functionaries of the regime. The Church, the judicial system, the education system, science and the arts were all controlled and utilised to influence and maintain the newly imposed order.