When you start to learn, you always feel that your teacher are the best because you trust your choice, especially you are following the famous teacher who knows how to advertise themselves, plus he has a lot of beneficial promoters.
After a few years of learning, one day you reached your teacher’s level, and then you will realize the other masters are better.
When you continue to keep tracing, you will find one master is better than one master. If you keep doing that with luck and hard working, you will find you are already sitting on the top and easily to see the others error. But on the same time, you also will find you are close to the end of your life.
四山高
困於谷底誤山高,
及至谷頂他山高。
他山還有他山高,
群峰腳下我山高。