Once upon a time there lived two calves and a chicken in a house. The owner of the house treated the chicken well and gave him best food to eat. The two calves were made to work hard in the fields the whole day and they were given grass and hay to eat. The younger calf said, "Why should the chicken get all the comforts when we work hard the whole day?" The elder calf said, "Never envy anyone as you don't know what price it had to pay for all the comforts. soon, the daughter of the house is going to get married and the chicken will be killed for meat. hence, it is being   giving the best food to eat." The   younger calf understood what the  elder calf said. From that day, the  younger calf was happy with its living. 
We should be happy with the giving of god rather than complaining because of the comforts others have. 