Why should we treat traditional culture with essence, dross and innovation?

To treat traditional culture, we should take its essence, discard its dross and bring forth the new? Attitude towards traditional culture: first of all, we must make clear what is the true essence of culture, what is the essence and what is the dross. The so-called traditional culture is actually the crystallization of the national spirit on which a nation depends for development and inheritance, and is a reflection of the evolution of civilization. ...