谁能帮我写一篇题为How to open the door of happiness 的演讲稿，不需很难，但要有内容

What is happiness? Different people have different ideas. Some people are rich; they think they are happy. Other people have many friends, so they feel happy. Still others are happy because their lives are meaningful. Happiness attracts everyone. For children, happiness often suggests eating something good or playing with toys. For a stamp collector, stamps bring more delight than meals. And for a scientist, a discovery or an invention rather than anything else gives him greatest satisfaction.
There was once a beggar who was always happy. The king saw him and wondered why he was so happy because he was so poor. However, the king could have whatever he wanted; yet he himself was not happy at all. Thus we can see one’s happiness doesn’t depend on whether he is rich or poor. Happiness is a state of mind. As long as one thinks he’s content and satisfied, he is happy.
As everything exist only because its opposite, happiness exists only when pain exists. Just as a person who doe