‘Awn ibn Abdillah (rahimahullah) said, “A man advised his son saying: O my son! You should adopt Taqwa and if you are able to be better today than you were yesterday and to be better tomorrow than you are today, then do so.”(Kitabuz Zuhd of Imam ‘Abdullah ibn Al Mubarak, Hadith: 846, pg. 254 and Hilyatul Awliya, vol. 4 pg. 263/264. Also see Musannaf Ibn Abi Shaybah, Hadith: 36741)