An old oven is easier to heat than a new one.
More French Proverbs:
He that is born to be hanged shall never be drowned.French
A jackfish does more than a letter of recommendation.
French
It is always well to keep hold of your horse's bridle.
French
To be willing is to be able.
French
He sups ill who eats up all at dinner.
French
The wolf will die in his skin.
French