The best time to plant a tree was 20 years ago; the second-best time is now.
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
成功不在于你赚了多少钱,而在于你对人们生活带来的改变。
矿工的安全永远不应该用成本效益分析来衡量。