Serve no one but Bane.
Fear him always and make others fear him even more than you do.
The Black Hand always strikes down those who stand against it in the end. Defy Bane and die - or in death find loyalty to him, for he shall compel it.
Submit to the word of Bane as uttered by his ranking clergy, since true power can only be gained through service to him.
Spread the dark fear of Bane.
It is the doom of those who do not follow him to let power slip through their hands.
Those who cross the Black Hand meet their dooms earlier and more harshly than those who worship other deities.