Numerous verses in the Holy Qur'an make it clear that an understanding of the inner-meaning (the implied) and in other words the true test of the Holy Book is specific to certain individuals and that the true status of the Qur'an and the hidden revelations therein will not be known to any but such special individuals whose characteristics include integrity.
According to Ayah 80 of Surah Wa'qi'ah, these individuals are the ones who have the ability to come in contact with this fountain of knowledge in the Qur'an.
Therefore, it can be concluded that the Ahlul-Bayt of the Prophet who are (according to Surah 33, Ayah 33), free of all ignominy, are the ones who shall witness the true status (meaning) of the Qur'an.
It is important to mention here that according to the Holy Verses, the true standing of the Qur'an is the vastness of the knowledge within its revelations. The final meaning thereof, and that of the latent verses or the less than clear content, was to be clarified to become the guidance to mankind. Therefore, those who have access to the true status of the Qur'an, meaning the true knowledge of the firm and unmistakable (Muh'kam) and to the unspecified (Mu'tashaabah), no doubt have full command of the interpretation and allegoric explanation of the Holy Verses.
The Qur'an calls the interpreters of the firm and unmistakable (Muh'kam) and
the unspecified (Mu'tashaabah) verses as: Al-Rasikhoon fil I'lm. meaning the Deeply Versed in Divine Knowledge (of the Qur'an).
source : http://www.maaref-foundation.com