However...
However, there are no direct, hostile remarks in his letters, whereas the situation is different with regard to Imam Baqir (as). In fact, the movement of Imam Baqir (as) is so strong that Hisham ibn Abdul Malik is frightened and tries to control the Imam by taking him to Damascus (erstwhile Shaam).
Of course, Imam Sajjad (as) too was taken to Damascus in shackles and handcuffs after his Imamate began in the aftermath of the Karbala episode, but the situation was different and Imam Sajjad (as) always reacted carefully. In comparison, Imam Baqir's (as) reactions were harsher. In a number of traditions, which have been quoted in the discussions of Imam Baqir (as) with his , he has called on them to set up the government, Caliphate, and Imamate and even heralded the future victory.
One of the traditions have been quoted in the Bihar-ul-Anwar: "A great number of people had assembled in the residence of His Holiness Abi Ja'far (Imam Baqir (as)). An old man leaning on a stick, saluted, and expressed his affectionate feelings to the Imam and sat on his side, saying: "Swear by God, I cordially love have affectionate towards you and also love the people who love you. But this love does not stem from any greed for material gains. I am also hostile to your enemies and hate them.
Likewise, my deliverance from your enemies is not based on my personal grudge against them. Swear by God, I consider lawful what you have announced lawful, and deem unlawful what you have ordained unlawful. I am waiting for your rule. Are you optimistic that I will see the days of your victory?
I am waiting for your "Amr" (government); that is, I am waiting for the arrival of your rule."[^2] The words "Amr" and "Amrokum" in the literature of this period - whether those attributed to the infallible Imams or those to their opponents - refer to the "Government". For instance, Harun in a letter to his son Mamun writes: "Swear by God if you challenge me over this Amr'....". In this statement, "Amr" refers to the "caliphate and Imamate".
Hence, we are waiting for your "amr" means: "we are waiting for your caliphate." The question of that old man is: Are you optimistic that I will see the days when you are in power? In reply to this question, Abu Ja'far asked the old man to sit on his side and then said: "O, the old man, the same question was asked from Ali ibn al-Hussein (Imam Sajjad (as))." However, we have not seen this question in the traditions attributed to Imam Sajjad (as).