True innovation comes from a deep understanding of user needs.
Suffering can destroy a person, but it can also shape them.
打开纠缠在一起的绳结的最好方法，不是要去「解开」绳结，而是要不断地把松动的部分拉得更宽。尽可能把那团乱麻弄大、弄松、弄开。当你打开绳结的时候，它们就会自行解开。这招适用于绳索、线、软管、毛线或者电线。
The best way to untangle a knotty tangle is not to “untie” the knots， but to keep pulling the loops apart wider and wider. Just make the mess as big， loose and open as possible. As you open up the knots they will unravel themselves. Works on cords， strings， hoses， yarns， or electronic cables.
一个好的数学问题的定义是它产生的数学，而不是问题本身。
控制的挑战在于在存在不确定性的情况下使系统工作。
Great leaders create more leaders, not just followers.