The past is never dead. It's not even past.
夜晚是我的爱人，音乐是我的情妇。
You can't knock on opportunity's door and not be ready.
水从山上流到滩头不是有意的，白云从洞中穿过也是无心的。
In mathematics, the art of proposing a question must be held of higher value than solving it.
生产与保护之间的平衡很微妙，但可以实现。
The strength of the state is crucial for the success of any society.