What is the most enlightening sentence for you?

A friend once said something to me when I first entered college, which enlightened me. He said: "No matter what you do, you must try your best to do it well. In the process of working hard, you will definitely learn something. Over time, your life will change qualitatively. If you just cope with it simply If you don't do things, you will probably gain nothing, but your attitude towards doing things will become simple and easy to deal with, and the key is to waste time.

How you treat life will be how life treats you. "