复杂很容易，简单却很难。

数学家们至今徒劳地试图在素数序列中发现某种规律，我们有理由相信这是一个人类思维永远无法穿透的谜题。

如果你没有偶尔失败，说明你不够努力。

To tax the larger incomes at a higher percentage than the smaller， is to lay a tax on industry and economy； to impose a penalty on people for having worked harder and saved more than their neighbors.