If your life is always go smoothly, you are only an ordinary man. You have no necessary to be jealous of happiness people. You should select many sufferings. Because a favorable circumstances born only a person who is boring and trifle. He has no winning personality. Human can become a great person by many suffering. Dogs have no necessary to become unhappy. Birds have no necessary to experience suffering. Only human can want to challenge to the risk. Because human is created like The God. The God receive the suffering by the treason of human being. But The God want to challenge to his adversity by himself. The God necessary will win from his adversity. The Holy Scriptures say, Ecclesiates, Chapter 7. Paragraph 8. ( Better is the end afterward of matter than its beginning ).