Therefore...

Therefore, when the conditions are reached whereby the propagation of the Divine word is influential through one Prophet and his successors, and the rules and the laws are applicable for the present and future and safeguarded from alteration, there is no need for the nomination of a new Prophet.

However the regular sciences lack the ability to be able to discern such conditions, but God the Supreme with all His infinite knowledge, knows best the time for the realisation of these conditions and it is He who declares the seal of prophecy as He has in His final Word. The sealing of the chain of prophecy does not mean that the bond between man and God or the door of guidance is terminated.

Nevertheless whenever God the Supreme feels the need and it is proper, He can bestow knowledge and guidance upon his chosen people. However this bestowal is not in the form of prophetic revelation but this esoteric knowledge has been given to the infallible leaders, according to Shi’ite belief, and God willing in the coming lessons this will be investigated thoroughly.

The answer to a spurious doubt From the above discussion it has become clear that the reason or the secret behind the seal of prophecy is that: The Prophet of Islam with the help of his successors and helpers can spread his message all across the world. The final word of God sent through the Prophet of Islam is preserved and is faultless from any form of alteration. The law of Islam is applicable and answerable to men of all time until the cessation of this universe.

However it is possible that some might raise a spurious doubt with regards to the latter issue. In the previous era the complication of sociological issues required the disposition of a new law through a new Prophet, and after the demise of the Prophet of Islam new and more complicated sociological phenomena have appeared which surely require new laws.

In order to answer this question one must point out, as has been indicated earlier, that the disposition of a new law due to the sociological developments cannot be determined through the guidance of man’s limited knowledge, because we are unaware of the wisdom and reasons behind the present perpetual law.

However we conclude from the arguments established upon the universality of Islam and also from the chain of prophecy being sealed by the Prophet of Islam that there is no need or requirement for a new law.