实现明天的唯一限制将是我们今天的疑虑。

Theoretically there is a perfect possibility of happiness: believing in the indestructible element within oneself, and not striving towards it.

The more you look, the more you see. The more you see, the more there is to see.

自动控制的根本问题是在存在干扰的情况下维持期望状态。