Through al-Hussein we gained strength. When battling a demon, whether a tyrant like Yazid or a disease like cancer, strength does not come from numbers; rather, it comes from the All Mighty.
Long ago, Hussein, a distinguished spiritual leader in Arabia faced an incredible challenge: accept the rule of a wicked tyrant and live, or reject the immoral leadership and be martyred?
Killing of Imam Hussain is actually the death of evil, as the longing to be righteous and just gets refreshed after each conflict. He was martyred on the 10th day of Muharram and many a Muslim fasts on that day and pledges to be righteous.