Pain can be a form of knowledge.

The most dangerous phrase in the language is, "We've always done it this way."

从长远来看，经济前景对那些灵活且消息灵通的人是有利的。

我永远感激我的贫苦父母。我欠他们一切，无论是我的教育、我的生命，还是我取得的任何成功。

It's not worth doing something unless someone, somewhere, would much rather you weren't doing it.