Even after all the hardship, suffering and wrong done by Yazid, the goodness of Imam Zainul Abideen and Lady Zainab continued to shine. They showed people what beautiful manners they had in the way they spoke and behaved.
It doesn't matter how dark it becomes, you can still see the light. It doesn't matter how bad people around you may be or what mean words they may say, nothing and no one can stop you from being and doing good. Nothing can stop your goodness from shining bright!