Spare the rod and spoil the child.
More Dutch Proverbs:
When the cat's away, it is jubilee with the mice.Dutch
Who chastises his child will be honoured by him, who chastises him not will be shamed.
Dutch
A good deed is worth gold.
Dutch
Measure twice, cut once.
Dutch
Daughters may be seen but not heard.
Dutch
Barking dogs seldom bite.
Dutch