After the middle of the present century, the first danger had in reality disappeared. Each of the three powers which now divide the world is in fact unconquerable, and could only become conquerable through slow demographic changes which a government with wide powers can easily avert. The second danger, also, is only a theoretical one. The masses never revolt of their own accord, and they never revolt merely because they are oppressed. Indeed, so long as they are not permitted to have standards of comparison, they never even become aware that they are oppressed. The recurrent economic crises of past times were totally unnecessary and are not now permitted to happen, but other and equally large dislocations can and do happen without having political results, because there is no way in which discontent can become articulate. As for the problem of over-production, which has been latent in our society since the development of the machine technique, it is solved by the device of continuous warfare (see Chapter III), which is also useful in keying up public morale to the necessary pitch. From the point of view of our present rulers, therefore, the only genuine dangers are the splitting-off of a new group of able, under-employed, power-hungry people, and the growth of liberalism and scepticism in their own ranks. The problem, that is to say, is educational. It is a problem of continuously moulding the consciousness both of the directing group and of the larger executive group that lies immediately below it. The consciousness of the masses needs only to be influenced in a negative way.