Yet another issue...
Yet another issue, which requires research and study is the radical moves and confrontation of the infallible Imams with the Caliphate system. There are ample examples of such movements throughout the Imamate era.
During the era of Imam Sajjad (as), that is, the apogee of repression, Yahya ibn Tawil, a disciple of his holiness, goes to the Medina Mosque, where addressing the people who had surrendered to the Caliphate system, or the officials of the Caliphate system, he recites a verse of the holy Qur’an. The verse contains a statement, which Prophet Abraham (as) had addressed to the infidels: "...
We disown you, and hostility and hatred have been set in between us for ever..." [60: 4] Also in Kufa, addressing the public and a group of the Shiites, he loudly makes some remarks, which contain protest against the ruling system. Mu’alla ibn Khunais used to participate in religious feasts while wearing untidy, wrinkled clothes, having untrimmed beards and hair, and showing a sad face.
When the lecturer started his sermon at the ceremony, he would rise his hands, saying: O, God, this is the pulpit and position which belongs to your vicegerents (the infallible Imams) and selected ones, but have been usurped and grabbed by others." Unfortunately, this sublime disciple (Mu’alla) who was praised by Imam Sadiq (as) and whose murderer was cursed by the Imam, has not received due attention by some people who doubt his piety.
Probably, the dirty hands of the Abbasside have played a role in tarnishing his image. Another issue, which requires extensive, profound discussion, is the issue of "Taqiyyah" or "precautionary dissimulation". To understand this issue, it is necessary to analyze all the traditions on camouflage, preservation, and clandestine activities in order to understand the true meaning of Taqiyyah or precautionary dissimulation.
Taking into consideration the contention of Imamate by the infallible Imams that was discussed above, as well as the severity of the caliphs' reactions towards the contentions and activities of the infallible Imams and their disciples, reveals the deep concept of Taqiyyah'. What is certain, is that the precautionary dissimulation does not mean giving up endeavors and activities, rather it means concealing the activities. This issue is quite discernible through the available traditions.
The said issues are some of the important aspects of the lives of the infallible Imams.