A major one which no one can overlook is technological and based on inventions and discoveries which have altered the whole basis of production and deeply affected social relations.

Without a common loyalty to either a state or a church they have nevertheless a vast deal in common.

Another cause of change, one less noticeable but fundamental, is the modern growth of population closely connected with scientific and medical discoveries. It is interesting that the United Nations has set up a special Commission to study this question.

We have lived through the flood time of fascism and of the nazism which ran its meteoric course at a cost to mankind in suffering and waste beyond all computation.

We speculate as to what is in store for us. But we not only undergo events, we in part cause them or at least influence their course. We have not only to study them but to act.