There is no point in showing the way to an old hare.
More Czech Proverbs:
No church without a sermon.Czech
The wedding lasts for two or three days, but the trouble stays longer.
Czech
It is not the thief who is hanged, but one who was caught stealing.
Czech
Gentlemen don't want to give much and are ashamed to give little.
Czech
The fool never undertakes little.
Czech
Hope is a great breakfast but a poor dinner.
Czech