Why is Zhu Yuanzhang's guiding ideology of building Nanjing Palace solemn and sacred?

When Zhu Yuanzhang instructed the following people to design Nanjing Palace, there was a guiding ideology, which was that it must be solemn and sacred.

Zhu Yuanzhang himself broke free from the bottom of society, and he always wanted to look noble and sacred. Therefore, under the guise of holiness, he can naturally make the following people obey themselves from the heart. Zhu Yuanzhang's craftsmen did not dare to neglect and worked day and night, finally meeting Zhu Yuanzhang's requirements.