a person needs a face; a tree needs bark

a person needs a face; a tree needs bark.  — One of the meanings of this proverb could be… a person needs a clean reputation to survive. Take note that face here is used metaphorically as the face (social custom). It can be used when someone behaves dishonorably (once or repeatedly), it can be said directly to that person as admonishment (as parents to a child). (This is a rough translation from a Chinese proverb)