Thirty spokes have a hub, when there is none, there is a car. 埏埴 as a tool, when it is not, there is a tool for use. The chisel is a room, and when it is not, there is a room. Therefore, some are used for profit, and nothing is used.

This passage is from Lao Tzu's Tao Te Ching. It is to the effect that the 30 spokes share a hub, and it is precisely because the hub is hollow that the axle is worn so that it can roll freely, so the car can walk. The clay is made into a vessel, and it is precisely because the vessel is hollow that it can be contained. When building a house, doors and windows are set up for people to enter and exit, and it is precisely because the interior is empty that people can live in it. Therefore, cars, utensils, and houses are all artificially created utensils for human use. And the reason why it is useful is precisely because the empty part of it exists.

At this time, Wu Zheng, who was cross-legged on the ground, completely understood the meaning of this passage for the first time.

Ever since Wu Zheng began to practice martial arts, especially after Tiefu opened the Great Zhou Tian due to misfortune, this was the first time that all the True Qi in his body had been completely exhausted. So much so that after shooting down the hidden weapon, he didn't even have the ability to act.

It is precisely because of this that Wu Zheng's empty meridians implicitly coincide with the true meaning of "nothing is used".

Originally, if you want to restore the true qi in your body, you have to meditate, or step on Lingyun's footwork to be able to perform, but this time there is no need to do so at all. When Wu Zheng reluctantly sat cross-legged on the ground, he suddenly felt that there were wisps of faint substances in the air outside his body, which were converging through his skin to the meridians that were empty of a trace of true qi.

I don't want to know, it must be the ubiquitous Five Elements Qi that exists in the air, also known as the aura of heaven and earth.

The True Qi in the meridians of the human body is originally the spiritual energy of heaven and earth that has been transformed by swallowing air for a long time, filtering through the meridians, or being refined. Therefore, for the first time, Wu Zheng was no longer obsessed with meditating on Lingyun's footwork, but relied exclusively on breathing air and automatically penetrating the skin to restore and replenish Zhenqi.

The feeling is very wonderful and incredible. Each meridian in the body is like a stream from nothing, along the way to gather and seep out of the grass, seep out of the roots of trees, seep out of the gravel and mud droplets, and at the same time grow a little bit, begin to flow slowly in the meridians, and finally concentrate on the dantian, after a little rotation, once again feedback into each meridian. And so on until there is more and more true qi in the meridians.

Wu Zheng, whose body and mind were all concentrated on this wonderful feeling, had long forgotten the battle just now, forgotten where he was, forgot himself, and forgot the existence of heaven, earth, time and space. Even if they were close, the whispered conversation of the three girls did not hear a word.

What's even more peculiar is that in the process of recovering the true qi in the meridians in the body little by little, Wu Zheng experienced a warmth that he had never experienced. It is like being in an airtight container filled with warm water, and the body and mind are completely released, without the slightest worldly worries and no longer a trace of vigilance.

"Mother's womb?!"

Wu Zheng can think of the only word that can describe his current physical and mental feelings. Indeed, it should be like an unborn baby, sleeping soundly in its mother's warm womb. I don't know the dangers of the outside world, I don't know the difficulties and ups and downs of life.

"Sister?!"

While Ning Xiaokun exclaimed in a low voice, Ning Xiaoqian and Princess Caifeng also discovered an abnormality from Wu Zheng's body.

First, wisps of white gas came out from the Baihui acupoint above Wu Zheng's head, like a steaming mist. Then, sweat began to flow from Wu Zheng's increasingly peaceful face. Although it was night, because there were four large braziers around Wu Zheng, the three girls could still see it clearly.

At first, it was normal sweat, but then the color of the sweat began to turn yellow and dark, and after a few breaths, it completely turned gray-black. Moreover, there was a faint smell coming out.

When Wu Zheng's clothes were also soaked with the stinking gray-black sweat, Ning Xiaokun began to get anxious. Although he wanted to wipe it for Wu Zheng, he still tried to resist the impulse from his heart.

began to see white gas coming out of Wu Zheng's head and sweat on his face, thinking that it was because the existence of the four braziers caused it to be too hot, but when he saw that the color of the sweat turned gray and black, even Princess Caifeng, who did not understand martial arts, faintly guessed that the scene in front of him showed that Wu Zheng's body was undergoing earth-shaking changes. Moreover, it should be on the good side.

Those gray-black, smelly, and sweat-like things that kept flowing out may be the impurities in Wu Zheng's body that have been excluded from the body.

Of course, Ning Xiaoqian and Ning Xiaokun could guess better than Princess Caifeng, who didn't know martial arts, that Wu Zheng was undergoing some amazing changes.

The two sisters glanced at each other, and both saw an unconcealable surprise in each other's eyes.

"I Ching marrow?!"

"Reborn?!"

For the eight words that Ning Xiaoqian and Ning Xiaokun exclaimed in a low voice, Princess Caifeng could certainly understand what they meant. Suddenly, he turned his face to look at Ning Xiaoqian, looked at Ning Xiaokun, and finally his eyes fell on Wu Zheng, who was sitting on the ground in the middle.

"You all exit the courtyard. ”

Although at this time, there were only a dozen guards left in the courtyard of the State Guest House with their backs to Wu Zheng and the three daughters, Princess Caifeng, who didn't want too many people to know about the scene in front of her, still drove the guards out.

"Sister?"

After there were no outsiders in front of her, Princess Caifeng asked in a low voice. Knowing the meaning of the two words said by the sisters does not mean that Princess Caifeng really understands what is happening to Wu Zheng.

"Your Royal Highness Princess, Wu Zheng should have opened up the Great Zhou Tian. That is, what martial arts people dream of, can freely absorb the aura of heaven and earth, so as to transform it into the highest realm of their own true qi. ”

"Because of this, the aura of heaven and earth, or the qi of the five elements, has completely changed Wu Zheng's physique. In martial arts, it is also called 'I Ching marrow', or 'rebirth'. ”

Ning Xiaoqian and Ning Xiaokun didn't know that Wu Zheng had already opened up the matter of Da Zhoutian. Although I knew that Wu Zheng was once in the Iron Mansion, and Zhang Xiaoou, the eldest son of the servant of the Ministry of Officials, Zhang Xiaoou, broke into the secret wooden sword formation of the Iron Mansion, and knew that Wu Zheng had been attacked by Zhang Xiaoou with a short sword with a highly poisonous short sword, but he never knew that Wu Zheng had been blessed by misfortune and opened up the Great Zhoutian. Tie Ning was the only one who knew about it.

In fact, even Wu Zheng himself didn't know that the last time he was in Tiefu, he did get through the Great Zhou Tian and also discharged some impurities in his body, but more of the toxins that were poisoned twice before and after were discharged. Because of this, the impurities in the body have not been completely discharged, and the situation of the I Ching has not been cut down and reborn.

Tonight, with the help of the complete exhaustion of the True Qi, for the first time, he could rely on his body to freely absorb the Qi of the Five Elements between heaven and earth, and finally reached a realm that Wu Zheng himself did not dare to imagine. (To be continued.) )