All of them had suffered all kinds of pains and were...
All of them had suffered all kinds of pains and were subjected to severe hardships for following that path. The trust would now be handed over to the next person. The powerful arms and steadfast steps of his vice-regent would be assigned the responsibility to carry that burden of trust forward. Therefore he had come to advise him about the most important issues of his mission. What was this important and cherished advice?
Now Imam Ali ibn al-Husayn (a.s.) who found himself more or less under conditions similar to his father's time, explained the key issues to his son and vice-regent, and offered recommendations accordingly.
He also emphasised that earlier, his father Imam Husayn ibn Ali (a.s.) had been similarly instructed by his father Imam Ali (a.s.): "What his father recommended..." This advice has continuously been emphasised since it was first given by the Commander of the Faithful Imam Ali (a.s.) to the next Imam-designate and onward through all the successive Imams by their proceeding Imams. What was that recommendation? The outcome and summation of that advice was „patience".
"My son stand for truth even if it is bitter." My son! Stand for the truth and be patient, even if it is bitter and inconvenient. Or in other words, on the road of truth one should never give up, and should never be frustrated by obstacles. Once you know and recognise the path of truth, you must support it all the way. All hardships, bitterness, failures, and inconveniences should be borne patiently to continue the journey forward.
It is obvious that the confrontation of truth and falsehood is full of hardship, bitterness, and inconvenience and one should not expect this path to be like a bed of roses. All these inconveniences and hardships should be resisted with patience for the sake of truth. This was the last will of the Commander of the Faithful Imam Ali (a.s.) given to Imam Hassan (a.s.), and subsequently it was given to all the successive Imams by their predecessors.
Also, we have witnessed that the Commander of the Faithful himself, and all of the righteous Imams after him, had actually followed that will. All of them, till the last moment of their lives defended truth accepting all the consequences, even at the cost of their lives (martyrdom).