This afternoon, I got a call from Hong-ren, a student at NHSH almost seven years ago. In fact, since he graduated, we have stayed in touch till now. He told me on the phone that he is very busy now. His life has only math and three meals. He is now a graduate student majoring in math at NTU. I told him not to work too hard. He gave me a very good answer: he enjoyed working hard on math.
This reminds me of Steve Job's speech "You've Got to Find What You Love." It's worth reading, especially for those who are at the crossroads of life. You can read the speech on the following webpage.
http://news-service.stanford.edu/news/2005/june15/jobs-061505.html