Change is the law of nature. Nothing is static. Happiness is neither static nor a concrete thing that can be bought or sold; nor is it something that, once possessed, can be retained forever. When a child is born, he is without sins. He needs milk and the love of his mother and he gives love to everybody who talks lovingly to him. He is happy in that. When he grows slightly older he gets pleasure in childish pranks and fun. When he gets married and assumes the responsibility of his family, he is burdened with care and worry. At this stage he is satisfied if he is able to meet the needs of his family. If he has enough food, good clothes to wear and a comfortable home, if he is burdened with loans or diseases, if he is independent and has an able and obedient wife and children, he feels happy and content.