Liberty means responsibility. That is why most men dread it.

The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.

The universe is full of magical things patiently waiting for our wits to grow sharper.

死亡是一种幸福，是非常深邃的幸福——是在痛苦不堪的徘徊后踏上归途，是严重错误的纠正，是从难以忍受的枷锁桎梏中得到解放。

我不是说唱歌手，我是一个科学的传奇。

The world is full of stories, but what matters is how you tell yours.

Sustainability starts with small steps, but requires big vision.

The man who removes a mountain begins by carrying away small stones.