To love is to risk being destroyed. To not love is to destroy yourself.
控制的挑战在于在存在不确定性的情况下使系统工作。
数学直觉就像肌肉一样 - 通过锻炼会变得更强大。
Simplicity is the ultimate sophistication.
The universe is full of magical things patiently waiting for our wits to grow sharper.