Nothing can stop the man with the right mental attitude from achieving his goal; nothing on earth can help the man with the wrong mental attitude.

Making something variable is easy. Controlling duration of constancy is the trick.

教育的真正目标是唤醒灵魂。

Responsible mining is not an option, it's an obligation we owe to our planet and future generations.

在我步入青少年之前，我感觉自己就像一位老人。

Good means not merely not to do wrong， but rather not to desire to do wrong.