At the beginning the student is without knowledge, but full of illusion.

Then, the student starts to learn. One illusion after the other is erased. But his knowledge grows.

When the student recognize, that his teacher himself is torn between knowledge and illusion he bows. But then he walks his way alone.

The student becomes the teacher and he sees that all his knowledge is just an illusion. The root of lore is nothingness and will be achieved through stomach and heart.

The teacher forgets more and more, but the lore grows within him. At the end the teacher is without knowledge, but also without illusions.

So the way teaches us to recognize life itself.