There is no difficulty which cannot be surmounted sooner or later. But even when a person has achieved something he desires in life, something else seems to be unfinished. So if he goes from one thing to another, achieving all he desires, the objects of his desire will multiply and there will never be an end to his desires. The more he has to do in life the more difficulties he must meet with. If he keeps away from the life of the world then his being here will be purposeless. The more important the task, the more difficult is its accomplishment. So evening follows every day, and this goes on till eternity.