A peacock（孔雀）was very unhappy with her ugly voice, so she spent most of her days complaining about it.
“It is true that you cannot sing," said the fox, "but look how beautiful you are!"
“Oh, but what good is all this beauty," cried the bird, "with such an unpleasant voice!”
“Listen," said the fox, "each one owns something good: you have such beauty; the nightingale（夜莺）has her songs; and the owl<猫头鹰）has his eyes. Even if you had a sweet voice, you would still complain about another thing. Why can't you just be happy about what you have already got?"
请从这则寓言中提炼出一个恰当的主题，写一篇不少于120词的读后感。内容包括：
1．简要概括这则寓言；
2．谈谈你的理解或感受；
3．以你或你身边的人或事加以论证。
【注意】
1．不得直接引用原文中的句子；
2．文中不能出现真实姓名和学校名称，否则记“零”分。