Rust wastes more than use.
More French Proverbs:
A crooked stick will have a crooked shadow.French
When a blind man bears the standard, pity those who follow.
French
There are good dogs of all sizes.
French
He that would eat the kernel must crack the nut.
French
Never look for a worm in the apple of your eye.
French
A dog with a docked tail is not afraid that its backside can be seen.
French