When one thinks about destiny the question arises whether there is a plan drawn up, and whether every occurrence in life must happen according to that plan; and, if it is drawn up, on what grounds, and by whom? If it is God who has drawn it up, how far can He be called just for making one happy and another miserable, one great and another small; letting one enjoy himself and at the same time making another suffer, though living under the same sun and walking on the same earth? And if it is not destiny but man's action, is it then the action of the past which brings about the action of the present, and if it is so, to what degree is man responsible for it? These questions take one to the depths of life's mystery, and once they are solved a great philosophical problem is solved.