help me with a "Never trust an enlisted man"quote



I'm not sure if this is a quote or not. I often saw it displayed on walls.

I think it was attributed to a seasoned Civil War Officer advising a young officer.

It went something out for the enlisted man, he is sly and crafty and not to be trusted.

Can any one help me with the entire quote and/or a source?
I think it came from a 19th (or very early 20th) century naval officers guide
I believe its from the Naval Officers Manual.. something like, " the enlisted man is unintellingent, but cunning, and bears close watching" or something like that.