The world of today reveals itself as at once powerful and weak, capable of achieving the best or the worst. There lies open before it the way to freedom or slavery, progress or regression, brotherhood or hatred. In addition, man is becoming aware that it is for himself to give the right direction to forces that he himself has awakened, forces that can be his master or his servant. He therefore puts questions to himself. The tensions disturbing the world of today are in fact related to a more fundamental tension rooted in the human heart. In man himself many elements are in conflict with each other. On one side, he has experience of his many limitations as a creature. On the other, he knows that there is no limit to his aspirations, and that he is called to a higher kind of life.