The conditions for imamate...
The conditions for imamate, according to the commentaries on the Holy Qur’an, is knowledge of all of the principles and practices of Islam, a knowledge whose base is in heaven and relies upon the knowledge of the Prophet so that he can guard and preserve the Divine Law of Islam.
Another condition is that Imam must be immaculate and infallible, free from sin and error and is the selected of the Divine immaculateness so that the station of imamate and spiritual and material, external and internal leadership of the imamate can be assumed as well as austerity, piety, courage which is necessary to confirm this important post. The discrimination of these conditions can clearly only be done through God and the Prophet.
It is He Who knows in whose spirit immaculateness has shown its rays, and it is He Who knows who has the highest knowledge needed for leadership, the sufficient courage and spiritual strength. Those who placed the selection of the Imam and the caliph of the Prophet in the hands of the people, in truth, changed the meaning of imamate in the Holy Qur’an and limited it to meaning only leadership and giving organization to the affairs of this world of the people.
Otherwise the conditions of imamate in the general and complete sense can only be determined by the Creator and it is He Who knows who has these qualities. The Holy Prophet, as well, could not have been selected by the vote of the people, but must rather have most definitely been selected by God Almighty, because other than God, no one can discern the necessary qualities in the Prophet. Did the Prophet not select a Person to succeed him?
There is no doubt that the precepts of Islam were universal and eternal and according to the direct verses of the Holy Qur’an, special to no time or place. There is, also, no doubt that at the time of the death of the Holy Prophet, the precepts of Islam had not moved beyond the Arabian peninsula.
On the other hand, 13 years of the life of the Prophet in Mecca were spent in struggle against polytheism and idol worship and 10 years of the life of the Prophet, which began from the time of the migration to Medina which was the period of the blossoming of Islam, was spent mainly in conflicts and wars imposed upon him by the enemies.