专家就是在非常狭窄的领域内犯过所有错误的人。
An expert is a person who has made all the mistakes that can be made in a very narrow field.
改变世界的唯一方法是改变自己。
I don't know what I'm doing, and that's the way I like it.
译文：志向不坚定的人，智慧就得不到充分的发挥，说话不守信用的人做事就很难获得成功。赏析：志向不坚定，做事就会摇摆不定，就会半途而废，不守信用就很难得到别人的信任，将无法在社会上立足。
