The Reason For Imam Husayn's Movement | Imam Khamenei

What was the aim and purpose of Imam Husayn (A) when he set off from Medina?
And what are the misconceptions that are prevalent among the people about his aim and goal?
Besides, what are the things that one may achieve when carrying out one’s duty?
And should the achievement/end result be our main goal or the ability to carry out our duty?
Imam Khamenei talks about the aim and purpose of Imam Husayn’s