In the terms of the Sufis there is a phrase, dakhl dar maqulat, "interference with the expert." For a nurse to attempt to direct the surgeon who is busy doing his work, for the clerk to advise the judge while he is taking a case, for a student of the violin to tell the composer what he must do in a certain composition, all these things are meant by that phrase. If one considered, in order to acquire a thorough knowledge in any line of work, what study, what practice, and what experience is required, and if one would consider, by the time a person has reached a certain age, what he has had to pass through and what he has had to learn, one would certainly have consideration for the expert and for age before expressing an opinion.