Study the Quran in the light of the Báb, Bahá'u'lláh and 'Abdu'l-Bahá's interpretation

"It is certainly most difficult to thoroughly grasp all the Surihs of the Qur'án, as it requires a detailed knowledge of the social, religious and historical background of Arabia at the time of the appearance of the Prophet. The believers can not possibly hope, therefore, to understand the Surihs after the first or even second or third reading. They have to study them again and again, ponder over their meaning, with the help of certain commentaries and explanatory notes as found, for instance, in the admirable translation made by SALE, endeavor to acquire as clear and correct understanding of their meaning and import as possible. This is naturally a slow process, but future generations of believers will certainly come to grasp it. For the present, the Guardian agrees, that it would be easier and more helpful to study the Book according to subjects, and not verse by verse and also in the light of the Báb, Bahá'u'lláh and 'Abdu'l-Bahá's interpretation which throw such floods of light on the whole of the Qur'án."

(On behalf of Shoghi Effendi, Directives of the Guardian, p. 64)