Not hearing is not as good as hearing it, hearing it is not as good as seeing it, seeing it is not as good as knowing it, and knowing it is not as good as doing it.

What is heard by the ears is not as good as what is seen by the eyes, what is seen by the eyes is not as good as what is practiced by the feet, and what is trampled by the feet is not as good as what is discerned by the hands.

What you have learned on paper will eventually make you realize it, but you will definitely know that this matter must be carried out.

It is useless to wake up in the mind and say it with the mouth, and do it on paper without practicing it on your own. One can only learn to skate after going through the stage of staggering around and making oneself look like a fool.

Human beings use cognitive activities to understand things and practical activities to change things; use the former to master the universe and the latter to create the universe.