You should know that you will never know guidance unless you know who has abandoned it, you will never abide by the pledges of the Qur’ān unless you know who has broken them, and will never cling to it unless you know who has forsaken it. Seek these things from those who own them because they are the life spring of knowledge and death of ignorance. They are the people whose commands will disclose to you their (extent of) knowledge, their silence will disclose their (capacity of) speaking and their outer appearance will disclose their inner self. They do not go against religion, and do not differ from one another about it, while it is among them a truthful witness and a silent speaker.