知识在心灵中以符号结构的形式表征。

In the end, we will remember not the words of our enemies, but the silence of our friends.

I think it's important to have a sense of humor about yourself.

权力平衡是维持国际体系和平的唯一途径。

创新是油气行业可持续发展的关键。我们必须拥抱新技术，推动效率和环境保护。

The only philosophy which can be responsibly practiced in face of despair is the attempt to contemplate all things as they would present themselves from the standpoint of redemption.

I embrace challenges because they make me stronger.