Mistakes are painful when they happen, but years later a collection of mistakes is what is called experience.

Mistakes are painful when they happen, but years later a collection of mistakes is what is called experience.

错误发生的时候是痛苦的，但是多年以后，一个错误的集合就是所谓的经验。

-- Denis Waitley 丹尼斯·魏特利