After Sima Yi entered the government service, Cao Cao began to trust him and sent him to the northwest border to protect the safety of the Cao Wei border. Sima Yi performed well in defensive work at the border, successfully repelling enemy attacks and becoming a famous general in Cao Wei. However, as time went on, Cao Cao began to worry that Sima Yi's ability and reputation would threaten his own position, so he began to exclude Sima Yi and prevent him from obtaining more power and reputation.

After Cao Pi took the throne, he also held a cautious attitude towards Sima Yi. Cao Pi knew that Sima Yi was exceptionally talented, but he was unwilling to let Sima Yi become a threat to him. During his reign, Cao Pi began to reuse his trusted aides and exclude Sima Yi from the political center. Although Sima Yi had a low status in the court, he did not give up his ambition and began to secretly accumulate strength, preparing for future opportunities.

Finally, after Sima Yan usurped the throne of Wei and established the Jin dynasty, Sima Yi was able to emerge and become an important figure in the court of the Western Jin dynasty. Sima Yi's talents and ambitions were fully realized in the Jin dynasty, while Cao Wei ultimately led to its own destruction due to its long-term exclusion and neglect of Sima Yi. This historical story tells us that if a ruler only focuses on personal power and status, and ignores the recruitment and reuse of outstanding talents in the world, it will lead to political failure and the destruction of the country.

Therefore, the reason why Cao Cao insisted on recruiting Sima Yi was mainly due to Sima Yi's talents and the situation of talent scarcity. Cao Cao was very clear that if he did not recruit Sima Yi into his ranks, he might be exploited by other forces. In addition, Cao Cao also did not want Sima Yi, such a talented person, to be recruited by other forces and ultimately become a stumbling block to his pacification of the world.

In contrast, Cao Pi did not continue Cao Cao's attitude, but held a cool attitude towards Sima Yi. This was mainly because Cao Pi lacked Cao Cao's political wisdom and vision. In Cao Pi's view, although Sima Yi was exceptionally talented, he was a member of Cao Cao's forces and could not possess independent power and status. In addition, Cao Pi did not realize that talents like Sima Yi were crucial for maintaining the stability and development of the Cao Wei dynasty.

After Sima Yan usurped the throne of Wei and established the Jin dynasty, Sima Yi became an important figure in the Jin dynasty. He excelled in both politics and military affairs and became one of the founding heroes of the Jin dynasty. The decline of the Cao Wei dynasty stemmed from the mistakes made by Cao Cao and Cao Pi in recruiting and reusing talents, ultimately leading to the rise of the Sima family and the destruction of the Cao Wei dynasty.

Overall, the reason why Cao Cao wanted to recruit Sima Yi was because he deeply understood Sima Yi's talents and the situation of talent scarcity. The reason why Cao Pi did not continue Cao Cao's attitude was because he lacked Cao Cao's political wisdom and vision, and did not realize that talents like Sima Yi were crucial for maintaining the stability and development of the Cao Wei dynasty. In the end, the decline of the Cao Wei dynasty became a footnote in history.

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