my father is an engineer. he works very hard.
    once i asked my father what the secret of success was. he didn't say a word, but wrote a few words on a piece of paper and handed it to me. i looked at the paper. on it was written: a=x+y+z.
    “what does it mean?” i asked.
    “a means success”, explained my father. “x means hard, y means good ways, and z means you must stop talking and start to work.”
    that’s right. from then on, i tried my best to be better.