" The Prophet once said to his Companions, "Do you want to see a man of Paradise?" A man then passed by and the Prophet said, "That man is one of the people of Paradise." So a Companion of the Prophet decided to learn what it was about this man that earned him such a commendation from the Messenger of God . He spent time with this man and observed him closely. He noticed that he did not perform the Night Prayer vigil (Tahajjud) or anything extraordinary. He appeared to be an average man of Madinah. The Companion finally told the man what the Prophet had said about him and asked if he did anything special. And the man replied, "The only thing that I can think of, other than what everybody else does, is that I make sure that I never sleep with any rancor in my heart towards another." That was his secret. "

― Hamza Yusuf , Purification of the Heart: Signs, Symptoms and Cures of the Spiritual Diseases of the Heart