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.

翻譯：

一天，父親教育兒子說：“一個人成功的關鍵就是嚴守諾言和足夠聰明。一旦你給了別人承諾，無論發生什么事，你都得實現它，這個就叫‘守諾言’。”
兒子問：“那么什么是聰明呢？”
父親回答：“聰明就是任何時候都別做這樣的承諾。”