This classic comes from Master Zhuangzi: "A man with discipline has a room, but his blade is not thick. No matter how thick or thin a person is, tolerance is great. "

Master Zhuangzi said: Wen has a cook named Woding. When he killed a cow for Wen, he just touched it with his hand, one leaning on his shoulder, one stepping on his foot and one leaning on his knee, and he could hear the sound of skin and bone separation. He used the knife just right. Wen Huijun sighed: "Hey, how nice! How can your technology be so skilled? " My technical worker put down his knife and said to Wen, "The reason why I have such good technology is because I know the truth of using a knife and apply it to technology." When I first learned to kill cattle, I saw a whole cow in my eyes. Three years later, what I saw was no longer a whole cow. Now I can know that the bones of cattle can be easily separated by feeling and using this spirit, and I don't need to look at cattle with my eyes. This is because practice makes perfect, and I can cut to the key points when I use it. A good cook changes a knife every year because he cuts hard with it; In January, almost all cooks changed a knife because he used it to chop hard. I have been using the knife for more than ten years now, killing thousands of cows. However, my knife looks almost as good as new, just like the one that has just been sharpened. There are joints between the bones of cattle, and there are gaps in the joints, but the blade is not thick. If you use a thick blade to cut the gap, of course, you will feel that this gap is very large, and the blade rotates inside, which is more than enough! "