The sword front is sharpened, and the plum blossom fragrance comes from bitter cold. Everyone sweeps the snow in front of the door, so don't worry about frost on other people's tiles ...

Translation: "The sharp edge of the sword comes from sharpening, and the fragrance of plum blossoms comes from bitter cold" means that the sharp edge of the sword is obtained from constant sharpening, and the plum blossoms that have survived the cold winter are more fragrant. The metaphor of "every man sweeps his own snow, and doesn't care about others' tiles" is not to mind his own business, or it is used to describe those who are wise to protect themselves.