出门一笑莫心哀，浩荡襟怀到处开。
出门时笑一笑，不要心怀悲哀，广阔的胸怀处处都能敞开。
States are inherently aggressive and expansionist because they exist in an anarchic international system where there is no higher authority to keep them in check.
沙漠之所以美丽，是因为在某个角落藏着一口井。
I don’t let opinions define me, I let them refine me.
The beauty of physics lies in its ability to explain the complexities of the universe with simple principles.
我认为人们相信天堂是因为他们不喜欢死亡的想法，因为他们想继续活着，也不喜欢别人搬进他们的房子、把他们的东西扔进垃圾桶的想法。