After seeing the consequences of the war of Kalinga, Ashoka’s heart was deeply hurt. He could not celebrate his victory. His peace of mind was lost. He could not sleep for many nights. He suffered a lot of regret and remorse. He realized that victory in war was not a true victory. ‘What did I gain by killing so many people? I gained only a sigh of millions of women and children,’ he thought. At that time Buddhist monk Upagupta preached about truth, nonviolence, compassion and virtue to Ashoka. He got immense peace due to that preaching. Thus, Emperor Ashoka’s heart changed.