It is a scholar's right upon you that you greet people in general as a whole but single him out with your greeting, that you sit in front of him, that you do not point to him with your hand, nor make hints against him with your eyes, nor say, 'but X said' in opposition to his statements, nor backbite anyone in his presence, nor whisper secrets to others in his gathering, nor pull on his robe, nor insist for him to continue if he is tired, nor show disinclination at the length of his speech, for verily it [i.e. his speech] is as a palm tree from which you [should] anxiously wait for something to fall from it for you.'