Assalam alaykum, Abu Fayd Thawban Ibn Ibrahim Dhu'l Nun al-Misri Allah be Merciful to him, is one of the most important figures in the history of Sufism. Indeed, he is considered as the first Sufi to have theoretically spoken about ma'arifat, maqamat, ahwal etc Find hereby attached some of his teachings/comments on key issues such as Repentance, Sincerity, Wisdom, Humility, Patience etc for your perusal and use.