The next sentence of "firewood, rice, oil, salt, sauce, vinegar and tea" is "everything is in someone else's house".
These two lines of poetry are from "Seven Things to Do in Opening the Door" written by Tang Yin, a famous painter, calligrapher and poet in the Ming Dynasty. This poem means that the author lives in poverty and cannot have the basic necessities of life such as firewood, rice, oil, salt, sauce, vinegar and tea, but can only watch what others have in their homes. This reflects the author's poor situation and helplessness in life.