However...
However, so long as you are a Muslim it is necessary for you to pronounce in Azan as well as Iqamah : "I testify that Muhammad is the Prophet of Allah". We and not others are the descendants and heirs of without mentioning whose name and invoking Divine blessings for him the prayers' of any Muslim are not acceptable. Hence, so long as Islam exists the honor and glory belonging to us, the descendants of Muhammad, will also remain established and confirmed'.
The Imam uttered these brief but fascinating words in reply to one person and perhaps uttered it in a low tone, but these very words uttered in low tones continue to resound in history. At times it so happens that only one sentence becomes the cause of coming into existence of many important books, speeches and articles.
At that time neither Ibrahim, nor Talha nor anyone else could assess the importance of these brief words and pay attention to its essence overlooking its form, but the Imam knew that even if he had come to Syria to utter only this brief sentence and to say nothing else during this journey, it would be sufficient to achieve the object he had in view, and those who could not make the requisite assessment at that time would shortly later applaud the plan chalked out by Imam Husayn and his companions and Ahlul Bayt.
Imam Sajjad got another opportunity when the Ahlul Bayt were made to stand by the gate of the Masjid of Damascus, the place where the prisoners were usually kept. An old man, who was a Syrian, came there and said: "I thank Allah that He has killed and destroyed you and annihilated seditious people like you". Then he began abusing the Ahlul Bayt. The fourth Imam kept quiet and let him speak on till he became silent.
In his reply, however, he did not say any improper thing nor complained to the old man of using abusive language. At that time the fourth Imam was ill and was also a traveler and had experienced the hardships of the journey from Kufa to Damascus. He was also bereaved and afflicted. Furthermore, he had arrived in a city which was at that time the center of the enemy of Ahlul Bayt. The Syrian used abusive language, expressed pleasure and thanked Allah for what had happened.
When all these causes of annoyance and fury are present who can keep calm and not lose temper or give a harsh reply? It is not possible for a person to control himself in such circumstances, whoever he may be.