My father is an engineer. He does well in his work and earns people’s respect.
Once I asked my father what the secret of success is. (is ---was,因为前面asked是过去时）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?”
“A mean success,” explained my father. “X means hard work, Y means good ways, and Z means to stop talking and start to work.”
“I see.”
From that day I tried my best to be better. A=X+Y+Z. My father’s right.

语法和句子结构都很好，并且有思想上的深度。Good!