英语故事:成功的关键

【英文原文】

Keys to Success

One day a father was teaching his son and said, "The keys to your success are keeping your word and cleverness. Once you give somebody a promise, you must carry it out on matter what will happen. This is called 'keeping one's words.'

"What is cleverness?" asked his son.
"Cleverness is that you'll never make such a promise, " the father answered.