As for the holiness of the second kind of caliphate...
As for the holiness of the second kind of caliphate, it is natural and constant as that of Prophethood itself. In other words each of the successors appointed according to the textual nomination was the holiest and the best figure of all people. In the past, the matter of the succession to authority was the reason for creating violent riot among the Muslims, and was a source of many sorrowful tragedies in the history of Islam.
Moreover, such a matter was not easy or possible at that time, for the people were stubborn. We think that it is nowadays easy and possible to bring the two parties together to accept a moderate idea. Thus they are able to discard disagreement, to adopt obligatory brotherhood, and to incline to righteousness. That is what Muslims should take into consideration, namely they should take care of the essence, and they should discard nonessential things.
They should take care of the true religion and should discard purposes. The Muslim should cling to the true Islam to please Allah. In the meantime, tribalism, feelings, and effects should not deceive him. The matter of the religion, that is the relation between the servant and his Lord and is the start on which his final result in the hereafter is based, is unlike the worldly matters. For the latter are liable, in many of their relations, to desires, and environmental customs.
Furthermore they are liable to man's, inclinations, tribalism, and effects. As for the true Muslim, he takes care of his pure true religion. Now, we, in the subject of the succession to authority, want to reunite Muslims to follow the true religion that is far above the foregoing things. So the Shi'ite person must recognize the succession to authority (of the first kind) as it was on the day when it occurred.
For they have been reported through the best ways to which the Muslim resort to adopt his religion. Then in this way the two parties are able to solve their main differences without injustice and selfishness.