Concerning the idea of destiny one may ask whether a plan is laid out so that every occurrence in life must be according to that plan. And if it is laid out, on what ground? Who has laid it out? If it is God who laid it out, how far could it be just on the part of God to make one happy and another miserable, one great and another small, to let one enjoy and at the same time make another suffer-living under the same sun, walking on the same earth? If it is man's action, is it in the first place the action of the past or is it the action of the present and, if it is man's action, to what degree is he responsible for it? These questions take a person to the depths of life's mystery, and once they are solved a great philosophical problem has been solved.