Thrift and extravagance: Deeply shocked by the rapid demise of the Sui Dynasty, Emperor Taizong decided to abstain from extravagance, try to be frugal, restrain his desires and reduce the burden on the people. In view of the phenomenon of too many officials, he ordered to streamline the organization, abolish a large number of redundant staff, and improve the system of three provinces and six departments of Emperor Wendi of Sui Dynasty. It can be seen that he loved the people as a son, feared their sufferings, and strived to be frugal, which also strengthened the people's trust in him and his rule.
Recruit talents and use energy: Emperor Taizong believed that "officials should have people, but not many people". He knows that people should be good at performing their duties, regardless of their qualifications and personal relationships. As long as they can govern the country and safeguard national security, they are entrusted with a heavy responsibility. He developed the imperial examination system, which had a far-reaching impact on the social and academic atmosphere at that time, and made all the talents in the world under his control. This shows that he values talents, regardless of their education level, as long as they are virtuous ministers.
Coachable with an open mind: Emperor Taizong knew that in order to govern the country well, he had to brainstorm and take good advice, so he listened to others' teachings with an open mind, which made the politics clear and the economy prosperous during the Zhenguan period. This shows that Emperor Taizong was an enlightened emperor.
Gains and losses in old age: In the middle and old age of Zhenguan, Emperor Taizong thought that he had greatly surpassed the ancients in martial arts, literacy, and nostalgia, so his complacency increased greatly and he no longer encouraged his subordinates to put forward opinions. After his deputies put forward their opinions, he reluctantly accepted them, and his greed for personal enjoyment was increasing day by day. At this time, Emperor Taizong was somewhat arrogant and extremely hypocritical and complacent.
Emperor Taizong's gains and losses tell us that we should listen to others' teachings with an open mind under any circumstances, and once we are complacent, we will not be loved by others.