In Shi’ite ideology...
In Shi’ite ideology, where Imamate is considered as the continuation of Prophethood, such discussions are of utmost significance. According to this ideology, an Imam's tasks would not encompass only the above affairs; rather, an Imam would be able to elucidate divine rules and Quranic issues. He has the knowledge required to classify between matters Islamically acceptable or unacceptable after the Prophet's death. Who can be an Islamic authority?
Who can teach us the Islamically recommended tasks and the prohibited ones? Who can we resort to when we are faced with an issue which was not been brought up during the Prophet's time? Whose judgment can we rely on? [^1]Who should the Islamic Ummah refer to when they are faced with difficulty in interpretating the Quran? Who should they follow as their guide?
[^2] This is where the question of the Prophet’s successor becomes a burning and urgent issue, because under such circumstances an Imam guides the Ummah on issues of Islamic knowledge, principles, and Islamic commands. We would never reach a desired result unless we identify the true Imam with valid reasoning. If Muslims shared all the Islamic principles and practical laws, the need for an Imam would never present itself so urgently.
However, there are disagreements among Muslims in nearly every Islamic issue. Now what is our task? We who have appeared on the face of the earth fourteen centuries after the Prophet (S)?
Do we have to refer to this or that Sahabi (for instance Abu Hanifah or Shafei) when we want to settle an Islamic issue or do we refer and resort to Imam Ali and his dearest offspring's who are, in the belief of Shiites, the most sacred, learned and honorable ones and who are appointed to their positions by the Prophet (S). Answers to such questions are presented in the discussions on the issues of Welayat (the Imam's successors) and the recognition of Imams.
The results of such investigations would put an end to our confusion and bewilderment. Even if we put aside the question of the caliphate and the issue of government and leadership of the Innocent Imams, which was their natural right, only an investigation into the true identity of the Prophet’s successor is of utmost significance, and is related to the Muslims` prosperity.