[blml] Exceptio probat regulam in casibus non exceptis [SEC=UNOFFICIAL]

[Tim West-Meads]

Alain wrote:
> 
> "exception probat regulam" means "an exception puts the rule to the 
> test", 

Basically I agree Alain, but I think it's a bit stronger than "test".  A 
reasonable translation might be "An exception *disproves* a rule, even in 
cases which appear to conform."  Or more colloquially "A single 
exception disproves a rule."

Tim