What I live for

Recently I read a article named what I live. This is a question I thought about for a long time.

When I was young, I thought I live for happiness. If I can play with friends whole day, that would be best way of living. When I grow a bit old, I think people live for creating some new thing. Because that time i was so interested in the science class, I thought people who can create new device like computer or some super machine is really successful.Therefore, I thought becoming a man like that is the goal of living. When i get in high school, I thought people live for help others. My father is a person like that. He is such a doctor that always take the health of his patient the most important thing. He did almost five surgeries everyday, which is almost twice than other doctors in China. He did that because he had a huge number of patient waiting for him to cure their disease, and he didn't want them to wait for too long. So he gave up his own spare time to help them. I think my father is a great man.
After reading this article ,I thought I should be a person describe in the book. It said that"Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and the unbearable pity for the suffering of mankind. These passions, like great winds, have blown me hither and thither, in a wayward course, over a deep ocean of anguish, reaching to the very verge of despair."
It is really a great summary for what people live for. When I grow older, I think I can understand it more clearly