Zhao Rong was curious and wanted to ask about the second Sword Emperor.

He just changed his mind and did it. Ever since he broke the mirror and Fuyao that night, it has become less talkative after waking up in Dali.

Zhao Rong had been busy in the academy all day. Apart from teasing Zhao Rong in the morning, it had not made much sound. After he entered Xia Chongzhai at night, it was even quieter.

Thinking of asking it after returning to Dali at night, Zhao Rong held back for the time being.

"Why."

This was the second time Zhao Xifu spoke to Zhao Rong tonight.

The tone is serious.

Zhao Rong glanced at him, continued to shake his head, shrugged and said casually: "I don't know either. Well, I saw a similar statement in a certain year and a certain day in a miscellaneous book that I definitely can't remember if you ask me now. I found it very interesting."

Although he said this with a sincere tone, he couldn't hide the smile on his face.

I couldn't help laughing, it seemed like some kind of bad taste.

"..." Everyone was stunned and couldn't help but look at his expression. It was obvious that even Su Xiaoxiao, the dumbest person mentioned by Zhao Rong, could see that he was lying. This guy was clearly not saying anything on purpose. How could he not know?

Very annoying.

Zhao Xifu looked at this brat whom he just met tonight. At first, he thought that Zhao was not only very handsome, but also very good in all aspects.

But his eyes looked a little bad. For example, he actually fell in love with this kind of boy and even sacrificed him a top-grade sword that all sword cultivators in the world dreamed of. Did he think that the natal swords given by God were too many...

Until now, the shopkeeper suddenly realized that he was wrong... Miss Zhao was obviously blind.

Zhao Xifu suddenly felt a little itchy.

He looked at Zhao Rong for a while and said deliberately: "Well, you said the fastest, but I don't think so."

Zhao Rong joked, "If it's not the fastest, then why can't you, the swordsmen who 'travel to the North Sea in the morning and to Cangwu in the evening', catch up with Zhuma after only a hundred steps?"

Zhao Xifu curled his lips and said confidently, "If he can't catch up, it may be because the two swords are of the same speed. Who says Yili must be slower than Zhuma?"

Zhao Rong nodded surprisingly and praised, "That's right, the shopkeeper is more knowledgeable. I knew that with the wisdom of shopkeeper Zhao, he would not be able to hide it from you..."

This round of flattery made Zhao Xifu's mouth twitch, and the more he listened, the more he felt something was wrong.

Sure enough, the next second Zhao Rong changed the subject:

"Well, imagine if the two swords have the same speed, then of course there is no way to catch up. Moreover, in this case, the distance between the two swords will of course remain the same, right... ahem."

Zhao Xifu couldn't help but frown again.

Because someone kindly reminded him that he had to face the question that made him uneasy again:

Yes, if Yili and Zhuma had the same speed, they would of course always maintain a distance, but the reality was that Yili was getting closer and closer.

So it's one that's faster?

However, Yili could not cross the last little distance no matter what, because it would take some time to move forward just this "little distance", and Zhuma would also move forward a little bit during this little time.

Yili could only get closer to the childhood sweetheart running in front of him but could not catch up with it.

In other words, as long as the original distance between Ichili and Zhuma can be divided infinitely, and each divided distance requires some time to catch up, then the distance that can be infinitely divided will require infinite time to catch up.

It's strange, the distance is getting closer, but the faster one can't catch up with the one in front.

So this is...

Almost, but not quite?

Or is it that during the process of chasing, every time it was approached, Zhuma would secretly speed up, so it was really the fastest sword, and that was why it could always leave Ikuri behind?

Unease comes from the unknown that is out of your control.

Zhao Xifu had not experienced this feeling for a long time. For him, he was no longer surprised by most things on the mountain. It was the same even when he first and last stepped into Xia Chongzhai in Jingwa Lane six thousand years ago.

Over the years, the only things that could easily make him marvel for a while were the news, big or small, about the Jixia Academy of the Jiang Dynasty in Tunan Continent brought by the various people from near or far who came to ask for wine.

It’s just that the metaphysical things that I’ve heard from the various schools of thought in the past are either too abstract and lofty, or have been around for a long time, like old wine in new bottles.

But now, the strange paradox that Zhao Rong brought out in an ordinary way is actually right next to him. I have never noticed it before, but now when I think about it, it is terrifying.

The shopkeeper became more and more surprised and suspicious the more he thought about it.

It was definitely not because he was ignorant or his thinking was off track, but the more he thought about the situation, the more it went against his worldview.

Zhao Xifu suddenly said: "No, the speed is definitely different, Yili must be faster than Zhuma!"

Zhao Rong nodded, smiled and said sarcastically:

"That's right. Not only is Ikuri faster than Zhuma, many swords are faster than Ikuri. But it's also strange that they can only follow Zhuma and can never catch up. So... there are swords that the fastest sword in the world can't catch up with? The word 'fastest' here is a bit a bit frustrating."

He sighed with regret, glanced at the shopkeeper, turned his head and winked at him, "So, shopkeeper, which sword do you think is better for the word fastest?"

Zhao Xifu remained silent.

Zhao Rong smiled and decided not to make things difficult for others. After all, this was considered as some kind of golden finger for him.

This paradox is a famous paradox proposed by a Western philosopher in the previous life, called "Achilles cannot catch up with the tortoise". However, tonight, Zhao Rong replaced them with Yili and Zhuma respectively and brought them up with a bad taste.

This paradox involves something metaphysical, namely time and space.

If we want to study and solve it in detail, we need to reveal the most fundamental appearance of time and space, as well as their essential operating laws, etc.

However, these, after being summarized by the philosophers of the past lives, have become the worldview that people in the past lives are accustomed to.

Standing on the shoulders of giants, Zhao Rong can solve this paradox in many ways.

However, in this world, this paradox was proposed for the first time... Well, Zhao Rong didn't know whether the predecessors of the Xuanhuang Realm or the various philosophers of the Jixia Academy had noticed similar problems.

However, they knew very little about the most essential nature of time and space. After all, when it comes to the word "time", the most concise description among the thousands of cultivators in the Xuanhuang cultivation world is nothing more than the four words "the long river of time".

The understanding of it is superficial and exposed.

As for what the 'water' in this river is, whether the 'water' is continuous or discontinuous... I have no idea.

The same is true for Lian Gui.

And at this moment, the reaction and expression of Manager Zhao, who seemed to be not simple and had a very loud tone, further proved this point.

Zhao Rong shook his head.

At this moment, he glanced at the shopkeeper who was lost in thought, and tentatively picked up the black wine jug.

Seeing that the latter did not stop him, Zhao Rong happily poured a glass for everyone at the table.

Starting from Zhu Yourong, he continued to pass it to them in a counterclockwise direction.

My two good friends have it, Xiaoxiao has it, Qianer has it, and Qingjun has it too.

But after pouring wine for Qingjun, he shook the jug and found that it was empty.

There were ten people at the table and nine cups in total, except for Zhao Rong, who was the one pouring the wine.

Under the gaze of everyone, he put down the empty wine jug as if nothing had happened, and smiled and invited everyone to drink.

The next second, Zhao Lingfei, Su Xiaoxiao, Zhu Yourong, Li Xueyu and Zhao Qianer at the table raised their hands almost at the same time.

It seems like it wants to... move the wine glass?

Then the women stopped moving at the same time.

“…”

“…”

After a moment of silence, Concubine Zhao Ling turned her head, glanced at them, and pursed her lips, "Mr. Zhu, little girl, Miss Li, this glass of wine is a gift from my husband, please don't refuse it... Well, just give him my glass, and you can drink yours."

Facing the woman with autumn eyes and a faint smile on her lips.

Zhu Yourong withdrew her hand immediately. She lowered her eyes slightly, looked at the wine glass, nodded slightly, then smiled politely. The next second, she raised her head without hesitation and drank the Bingniang wine in one gulp.

Su Xiaoxiao said "oh oh" twice, covered the wine glass with both hands, and drank the wine like Mr. Zhu.

"Thank...thank you." The little fox demon glanced at Zhao Rong.

Li Xueyu blushed and responded. She looked at the wine glass Zhao Rong handed to her with a complicated look. She didn't drink it immediately, as if she was hesitating about something...

Concubine Zhao Ling pushed her Bingniang wine in front of Zhao Rong.

Zhao Rong shook his head.

Concubine Zhao Ling also shook her head, looking somewhat stubborn.

Zhao Rong was about to refuse, but Zhao Lingfei said first: "I am determined to climb to the peak of swordsmanship step by step. I will not drink this cup of anti-aging wine."

Yu Huaijin, who was writing and drawing on the table with a frown on her face, paused for a moment and glanced at the top genius of Taiqing Xiaoyao Mansion.

This sentence has a lot of meaning.

Bingniang wine can preserve one's youth, and if a cultivator can break the mirror in a relatively short period of time, his life span will increase and his appearance will remain almost unchanged.

And when one breaks through to a very high level, one can keep his youthful appearance forever.

Therefore, the peak of swordsmanship that Zhao Lingfei wants to climb is at least higher than this "very high" realm, and this "very high" realm is much higher than Mr. Zhu's current realm...

Zhao Rong was stunned when he heard the words, and heard the sharpness hidden in her gentle tone.

He felt inexplicably happy and stopped refusing, drinking the wine from Bingniang.

Everyone was drinking and the atmosphere was lively.

Zhao Rong put down his wine glass. At this time, Zhu Yourong frowned and said:

"Tzuyu, why is this happening?"

Obviously, she deserves the paradox that Zhao Rong just proposed.

Yu Huaijin also nodded, and followed the teacher, looking at Zhao Rong seriously.

Zhu Yourong continued:

"Tzuyu, we all know that if Yili and Zhuma were to compete, Yili would definitely be able to catch up with Zhuma. Even if he had to take 10,000 steps, it would only be a matter of time...

"Well, I don't mean to look down on Miss Zhao, but I heard that Miss Zhao's childhood sweetheart has unfortunately fallen... So, why can't Yili catch up with his childhood sweetheart in this reasonable hypothetical scenario you mentioned?"

Zhao Xifu was thinking about something and raised his eyes calmly.

He, together with Zhu Yourong, Yu Huaijin and others, stared at the young scholar in front of them who had a hesitant look on his face.

The conclusion that 'Yili can't catch up with his childhood sweetheart' may seem absurd, but if you think about it carefully, all the premises of the conclusion are reasonable and valid. So why would we come to a conclusion that goes against common sense based on logical reasoning?

Is there some fundamental way of heaven and earth hidden in this that has never been discovered by the ancient sages?

Zhao Rong sighed helplessly.

In fact, he doesn't really care about killing but not burying, but for this issue, he believes that the most valuable thing is the thinking process.

In Zhao Rong's previous life, many philosophers and mathematicians tried to propose a solution to this paradox, and in the process, many interesting "answers" were born.

Any response to it will prompt people to reflect on the most fundamental metaphysical assumptions and explore how to correctly understand time and space...

The thinking process is the most important. Maybe this paradox can give birth to a new answer in this world?

Zhao Rong felt that this was what he wanted to see when he proposed this interesting paradox. He even thought about whether he could spread this interesting paradox of "not being able to catch up with childhood sweethearts" to Tunanzhou to see what unique explanations the scholars of the Jixia Academy would have...

Zhao Rong felt that this was also a kind of self-proclaimed mission of his "two lives as a human being"... rather than simply telling some answers and returning the pearl in exchange for the casket.

However, Zhao Rong at this time obviously ignored the power of this paradox, which was far more powerful than the first one he proposed before, because... it involved the mysterious river of time.

…