What does loyalty and filial piety mean since ancient times?

1, it is difficult to be both loyal and filial, which means it is difficult for a person to be loyal to the country and filial to his parents at the same time.

2. This sentence comes from Bai Juyi's "Except Cheng Zhi Gong Right Servant Shooting System" in the Tang Dynasty: "The industry biography must be short, and the name is in the book; Accumulate the sky with self-cultivation, loyalty and filial piety. " Gao Tang, a master of pipa in Yuan Dynasty, said: "Life should be both loyal and filial."