What is the relationship between noble Tianyi and noble Taiyi?

Tianyi is Taiyi, why is Taiyi a noble person? It's very simple. Yi is the weakest and can bend according to the trend, like a wicker that can't be broken no matter how hard it is bent. This is a noble person, so Taiyi is the most expensive, and Taiyi is the best and the best. The softest, most immature and weakest person. In line with Lao Tzu's principles, for example, is the tooth hard or the tongue hard? When a person reaches eighty years old, all his teeth have fallen out and only his tongue is left.