They possess all the characteristics which give the...

They possess all the characteristics which give the superiority in the right for vicegerency and leadership. Consequently, no one else in the ummah enjoys the right of patronage and guardianship. That is why the Prophet declared them his vicegerents and successors.

About will and succession the commentator Ibn Abi'l-Hadid Mu`tazili writes that there can be no doubt about the vicegerency of Amir al-mu'minin but succession cannot imply succession in position although the Shi`ite sect has so interpreted it. It rather implies succession of learning.

Now, if according to him succession is taken to imply succession in learning even he does not seem to succeed in achieving his object, because even by this interpretation the right of succeeding the Prophet does not devolve on any other person. When it is agreed that learning is the most essential requirement of khilafah (caliphate)…