Do not keep secret from your friend what your enemy already knows.
More Danish Proverbs:
The mouse is knowing, but the cat more knowing.Danish
Flowers are the pledges of fruit.
Danish
Eye-service is the courtier's art.
Danish
Act so in the valley, that you need not fear those who stand on the hill.
Danish
The forest has ears, and field has eyes.
Danish
A rickety chair will not long serve as a seat.
Danish