How to understand the relative stability of traditional culture?

The core values of traditional culture were formed very early, and have continued for five thousand years of Chinese culture, and its core ideology and spirit have basically remained unchanged in the three thousand years of recorded history. This is stability.

But traditional culture in the long history of the impact and influence of the outside world, with the progress of history and the concept of continuous development, traditional culture and foreign culture gradually fusion change, so it is relative