自身无灾无病，感受不到快乐，等到生病卧床，才了解到无灾无病的快乐；家中平安无事，感受不到快乐，等到祸事临头，才体会到平安无事的快乐。
The important thing is not to stop questioning. Curiosity has its own reason for existing.
物理定律是普遍的，但我们对它们的理解在不断演变。
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."