A Proverb From Hell

Today at lunch an hispanic friend & colleague was telling me about his previous life as an investigative reporter in the Southern California's area.
At one point of his captivating story he quoted the following dictum, coming from some anti-crime operative:

-Los crimenes que se cometen en el Infierno no tienen angeles como testigos-
-The crimes that are committed in Hell do not have angels as witnesses-

Now, that is a hell of a proverb!