在计算复杂性的研究中，我们常常发现可能的边界是由我们想象力的极限定义的。

In the era of smart cars, software defines the vehicle.

革命道德不是从天上掉下来的。它是在日常斗争中培养，在革命活动中锤炼的。

But there is no such liberty as the power to dispose of what we please.

We shall never prevent the abuse of power if we are not prepared to limit power in a way which occasionally may prevent its use for desirable purposes.