Know the end.

The old saying goes, "Know what to do, know how to stop, know how to stop, and then do it." This means that you must understand "action" and "stop", and know "walk while stopping."

"Content" means that you are "not satisfied, but you can accept it" no matter how much someone gives you; "knowledge" means that you have reached a certain level, and you reach out to block it and say, "I don't want it anymore."

"Satisfaction" comes from others, and "knowledge" comes from oneself. "Being contented" means not being greedy, and "knowing to stop" is not following along.