phrases, sayings, idioms and expressions at

What is required is not forbidden.

Posted by Kate on June 20, 2004

also, ... "What is sanctioned is mandatory."

These two phrses have turned up in a conversation. I have searched for their sources a bit.

All I have found so far is that "what is not required is forbidden" may have Prussian origins ... while a contrrasting phrase, which is more permissive in meaning has English origins.

I am currently wondering whether they have a source in a specific philosopher or a holy book ...