Or is it that there are locks upon their hearts?

Or is it that there are locks upon their hearts?” (47:24) The Qur'an also says in one of its verses: “(This is) a Book We have revealed to you abounding in good, that they may ponder upon the verses”. That is, We have not sent the Qur'an to be kissed, embraced and put on the niche to gather dust, but for men to read and to contemplate about its contents: That those endowed with understanding may ponder its signs and so remember.

(38:29) Ayatullah Murtadha Mutahhari says: “Scores of verses in Qur’an emphasize the importance of contemplation in the Qur'an and interpretation of the Qur'anic verses, although not an interpretation based on personal caprices and bias, but a just, truthful and balanced interpretation free of all traces of selfish interests. “If we try to comprehend the Qur'an in an honest and unbiased way, it is not at all necessary to solve all problems that we find in it.

In this regard the Qur'an is similar to Nature. In Nature, too, a number of mysteries have neither been solved yet, nor can they be solved in present conditions, yet are likely to be solved in the future. Moreover, in studying and understanding nature, man has to tailor his ideas in accordance with Nature itself. He is forced to interpret Nature in accordance with its reality. He cannot define Nature in terms of his own caprices and inclinations.

“The Qur'an, like the book of Nature, is a book that has not been sent for a specific age and time. Had it been otherwise, all the secrets of the Qur'an would have been discovered in the past; this heavenly Book would not have presented its charm, freshness and vitality. But we see that the possibility of contemplation, reflection and discovery of new dimensions is inexhaustible in the case of this Holy Book”.

This is a point that has amply been emphasized and clarified by the Prophet and the Imams. In a tradition, it is related from the Prophet (S) that the Qur'an, like the sun and the moon, will present its movement and continuity; that is, the Qur'an is not static or monotonous.

In 'Uyun akhbar al-Ridha, from Imam Ridha (as), it is quoted that Imam Ja'far Sadiq (as) was asked about the secret of it that as the time passes and the more it is read and recited, the Qur'an increases in its novelty and freshness day by day. The Imam Sadiq (as) answered: “Because the Qur'an is not for an exclusive age or for an exclusive people”.