We know the contented means the self satisfaction with what they earn and gain by own labour. Be happy with what we have now and praise to have them and all that is happening. And plan and work to the top  for future without much expectations. And secure the peace of future. Here is the emotional story of a dog.
                   One day a kind butcher saw a dog and gave a large piece of bone to that hungry dog. The dog picked the bone in his mouth and went across the stream because he wanted to eat it at a lonely place. As he was walking over the bridge as daily activity, he looked into the stream. He saw a dog with a large piece of Bone in his mouth walking on. He was not aware that it was his own reflection. He thought that this is an another dog with a piece of bone. " Oh! What a juicy bone this dog has! If i can get this bone, I will have two bones to eat. I am so hungry. I'll bark loudly to frighten the dog away. He'll run away leaving the bone behind and with advantage I'll take it for myself." With such thoughts the dog barked loudly in joy. There was no reply to his barking but only a loud splash of bone on water. The piece of bone from his mouth fell into the stream and the dog became sad and remained hungry.
Lesson : Be contented with what you have in life.