A young man asked Albert Einstein, the great German scientist, what the secret (秘诀) of success is. The scientist told him that the secret of success is hard work. A few days later the young man asked the same question again. Einstein was annoyed. He didn't say anything, but wrote a few words on a piece of paper. On it was written: A=X+Y+Z.

    "A means success" explained the old scientist. "X stands for hard work, Y for methods and Z means stop talking and get down to work."