What does the Zen proverb "Vulcan comes for fire" tell us?

In Buddhism, there is a saying that "Bing Ding boy came to beg for fire": only the prison was in the Dharma Eye Society and was never invited into the house. One day, the dharma eye asked the cloud, "Why didn't the prison enter the house?" "Don't you know," Yun Ze said, "there is an armor in the green forest with a head on it." Fa Yan Yun: "Please try to show it to me." Then the cloud said, "I asked how to become a Buddha?" Lin Yun: "Bing Ding boy came to ask for fire." Fa Yan Yun: "Good word, I'm afraid I'm wrong, but let's talk more." Then the cloud said, "Bing Ding belongs to fire, so we should seek fire with fire. If someone is a Buddha, we will go to the Buddha. " Fa Yan said, "The prison authorities really missed the meeting." Cross the river alone if you are not angry. The watchful eye said, "If this man can be saved, he can't be saved without saving." Then he went to the middle road and thought, "He is a good knowledge of 500 people. How does he earn me? " Then he went back to Fayanyun and said, "Dan asked me and I'll answer for you." Then he asked, "What is a Buddha?" Fa Yan Yun: "Bing Ding boy came to ask for fire." Then you will realize. Look at him, the ancients. What is the truth? Don't just teach people to say, it must be your own spirit. It seems that you are willing to bear it with him. It is not difficult for him to look at the cross street and be a man. So the monk asked the dharma eye, "How about Buddhism?" Yan Yun: "You are Hui Chao." I am so disappointed that I can't see the door: "If you don't care, you will be poor." Think about it, there is a saying in He's cartoon "On Zen" that "Vulcan seeks fire": Xuan asks the monk Qingfeng for advice on what is Buddha. Answer: Vulcan is coming for fire! Xuan is suddenly, happy to leave. The master asked Xuan what he knew, and Xuan replied cheerfully: Vulcan is fire, but I asked others if it was fire, just as I asked Buddha that I was a Buddha myself.