Ancestor worship is the worship of one's own forebears; it expressed the completeness of rites for parents and ancestors, but also a fear that crossing the ancestors could lead to unhappiness for the family.
「崇祖」則是祭祀自己的祖先，既表示「慎終追遠」，同時也是怕子孫有什麼不對之處，冒犯了祖先，使得一家不得安寧。