Here "observes" refers to worshiping. Alternate translation: "The person who worships on a certain day does it to honor the Lord" (See: [[rc://en/ta/man/translate/figs-explicit]])
The word "everything" is understood from [Romans 14:03](./03.md). It can be repeatd here. Alternate translation: "the person who eats every kind of food" (See: [[rc://en/ta/man/translate/figs-ellipsis]])
The word "everything" is understood from [Romans 14:03](./03.md). It can be repeatd here. Alternate translation: "He who does not eat everything" or "The person who does not eat certain kinds of food" (See: [[rc://en/ta/man/translate/figs-ellipsis]])