Casting the iron whilst it is hot.
More Dutch Proverbs:
Counsel is as welcome to him as a shoulder of mutton to a sick horse.Dutch
A praying pirate is definitely a sign of danger.
Dutch
Herring in the land, the doctor at a stand.
Dutch
Nobility of soul is more honorable than nobility of birth.
Dutch
He who wants a new world must first buy the old.
Dutch
Ill begun, ill done.
Dutch