On the day of Ashura, when the great son of Imam Hussein (AS), Hazrat Ali Akbar (AS), asked his father to let him fight, Imam Hussein gave him the permission without any hesitation. Certainly, those who only see the Almighty Allah and seek only his satisfaction do not hesitate ever for a moment; these are the people who sacrifice all their wealth and properties on the way of their true lord.
If the heart of Imam Hussein peace be upon him was filled with love of any of except for Allah, he was certainly incapable of doing such a massive sacrifice on the day of Ashura, he was the one who created such a passion and love on that day which has had no match throughout the history. There was no spiritual veil between Imam Hussein peace be upon him and the Almighty Allah, and he saw nothing but the lord of the universe.
source : erfan.ir