In Shia Islam, the Imamah is a doctrine which asserts that certain individuals from the lineage of the Islamic prophet Muhammad are to be accepted as leaders and guides of the ummah after the death of Muhammad. Imamah further says that Imams possess divine knowledge and authority (Ismah) as well as being part of the Ahl al-Bayt, the family of Muhammad. These Imams have the role of providing commentary and interpretation of the Quran as well as guidance. Shias believe that Imamah is of the Principles of Faith (Usul al-Din). As the verse 4:165 of Quran expresses the necessity to the appointment of the prophets; so after the demise of the prophet who will play the role of the prophet; until the people have not any plea against Allah. The same logic that necessitated the assignment of prophets also is applied for Imamah. That is Allah must assign someone similar to prophet in his attributes and Ismah as his successor to guide the people without any deviation in religion.
This text provides a good analysis of the lives of the Infallible Imams while presenting the different methods, struggles, and circumstances of each Imam and how they may have acted similarly or differently. However they have all acted as Allah (s) desired of them and that if each of the Imam were in the same position as the other Imams, they would’ve behaved similarly.