A cow does not know what her tail is worth until she has lost it.
More French Proverbs:
He that parts with his property before his death prepares himself for much suffering.French
All truths are not good to be uttered.
French
A mistake is no reckoning.
French
You cannot have the bacon and the pig at the same time.
French
One fool always finds a greater fool to admire him.
French
The communal donkey gets the heaviest burden.
French