As I promised, The Ettiquette of the Student: if you are a student, then the manners of a student with the teacher are: to be the first to greet and offer the salutation of peace; not to speak too much in his presence; not to speak unless asked something by the teacher; not to ask questions without first seeking permission; not to say, in contradiction to what he has said, "So-and-so [e.g., another scholar] says something different from what you say"; not to point out something contrary to his opinion, thinking himself more learned than the teacher; not to whisper to another student in his gathering; not to look around, but rather to sit with good manners, eye downcast, as though in ritual prayer; not to burden him [with questions] when he is tired or weary; to stand when he stands [out of respect]; not to follow him from the gathering, talking to him and asking him questions; not to ask questions on the way to his home until he reaches there [and grants permission]; and not to form a bad opinion of him regarding actions that appear, outwardly, to be blameworthy, for he knows better about his own personal affairs. Let [the student] recall the words of Musa to Khidr [`alayhim assalaam]:"He said, 'Have you made a hole [in the boat] to drown the owners of it? Indeed, you have done a peculiar thing!'" [Qur'aan 18:71]. Mistaken was he in his condemnation of Khidr's actions, because he relied on their outward appearance. [Imaam Ghazzaali's Bidaayat al-Hidaayah]