A cock is valiant on his own dunghill.
More Dutch Proverbs:
To-day stately and brave, to-morrow in the grave.
Dutch
Between two stools you come to the ground.
Dutch
Clothes make the man.
Dutch
It is better to ride for half a year on a good horse than to spend your entire life riding on a mule.
Dutch
Advisers are not givers.
Dutch