Therefore...

Therefore, when mischief come to confuse you like the segments of darkened night, then hold fast to the Qur'an;  as it is the intercessor whose intercession shall be granted;  and it is a credible advocate;  and whoever keeps it before him, it will lead him to the Garden;  and whoever keeps it behind, it will drive him to the Fire;  and it is the guide that guides to the best path;  and it is a book in which there is explanation, particularization and recapitulation;  and it is a decisive (word), and not a joke;  and there is in it a manifest (meaning) and an esoteric (one);  thus its apparent (meaning) is firm, and its esoteric (one) is knowledge;  its exterior is elegant and its interior deep;  it has (many) boundaries, and its boundaries have (many) boundaries;  its wonders shall not cease, and its (unexpected) marvels shall not be old.

 There are in it the lamps of guidance and the beacon of wisdom, and guide to knowledge for him who knows the attributes.  Therefore, one should extend his sight; and should let his eyes reach the attribute; so that one who is in perdition may get deliverance, and one who is entangled may get free;  because meditation is the life of the heart of the one who sees, as the one having a light (easily) walks in darkness; therefore, you must seek good deliverance and (that) with little waiting”.

After his death, the Prophet appointed his progeny Ahlul Bayt to carry on this work after him - to explain the true meaning of Qur’an to the people. It is clear from his unanimously accepted tradition: “I am leaving behind among you two precious things; as long as you hold fast to them you will never go astray after me: The Book of Allah and my progeny, my family members; and these two shall never separate from each other until they reach me (on) the fountain”.

And Allah has confirmed, in the following two verses, this declaration of the Prophet that his progeny had the real knowledge of the Book: Allah only desires to keep away the uncleanliness from you, O people of the House! and to purify you a (thorough) purifying (33:33); Most surely it is an honoured Qur'an, in a Book that is hidden; None do touch it save the purified ones (56:77 -79) .