One day, Chang-sha Ching-tsen (d. 868), one of the well-known Chinese Ch'an masters, wandered in the mountain. When he was back just at the gate of the temple, the head monk asked him:
-Where have you been, Sir?
"To make a cake, we need to put together many ingredients – flour, butter, milk, eggs, and so on. Our teachers show us how to make a cake and bake a few for us. They may be very delicious and we may enjoy them greatly. Due to our teachers’ kindness, we now know how to make a cake. This does not mean that we cannot make some changes, add some different ingredients, and bake cakes that are even more delicious than those our teachers made. In doing so, we are not being disrespectful toward our teachers. If the teachers are really qualified, they will rejoice in our improvement on the recipe and enjoy the new cakes with us.