Pardon one offense, and you encourage the commission of many.
--- Publilius Syrus
(~100 BC), Maxims

The problem of power is how to achieve its responsible use rather than its irresponsible and indulgent use - of how to get men of power to live for the public rather than off the public.
--- Robert F. Kennedy (1925 - 1968),
'I Remember, I Believe,'
The Pursuit of Justice, 1964