Bad charcoal only makes smoke.
More French Proverbs:
The coalheaver is master at home.French
Fair flowers do not remain long by the wayside.
French
A man who wants bread is ready for anything.
French
When the devil says his paternosters he means to cheat you.
French
Fair is he that comes, but fairer he that brings.
French
There are no foolish trades, there are only foolish people.
French