Hear, attend, but speak little.
Never answer a question not addressed to you, but if asked answer promptly, and never be ashamed to say “I know not.”
Do not dispute for disputation’s sake.
Never boast before your elders.
Never seek the highest place, nor even accept it if offered to you.
Do not be over ceremonious.
Observe in all cases the etiquette appropriate to the time, place, and persons present.
In indifferent matters conform to the practice and wishes of those with whom you are associating.
Do not make a practice of anything which is not either a duty or calculated to increase the comfort of your associates, otherwise it will become an “idol” to you, and it is incumbent on everyone to break his “idols,” and renounce his habits.
(See Hughes’ “Dictionary of Islam.”)