实现自己的价值很重要，在付出的时候这种被需要感是很rewarding的。

the best way to find yourself is to lose yourself in the service of others.--Mahatma Gandhi

No one has ever become poor by giving.--Anne Frank

We make a living by what we get, but we make a life by what we give.--Winston Churchill

For it is in giving that we receive.--St.Francis of Assisi.