I'm not sure which one of these apparently flatly contradictory proverbs I heard first but I have definitely heard both several times. One of them is:
There is honour among thieves.
Another is:
No honour among thieves.
Do they simply mean the opposite of each other, therefore, at least in my mind cancelling each other out, or is there a subtlety here that I am not picking up on? Are they related, perhaps sharing an origin and then somehow becoming inverted?