Peter Abelard antiquity for their virtues and for their discovery by the use of reason of many fundamental aspects of Christian revelation. At some point in this time Abelard wrote, among other things, his famous "Historia Calamitatum". This moved Héloïse to write her first Letter; the first being followed by the two other Letters, in which she finally accepted the part of resignation, which, now as a brother to a sister, Abelard commended to her. Sometime before 1140, Abelard published his masterpiece, "Ethica" or "Scito te ipsum" (Know Thyself), where he analyzes the idea of sin and that actions are not what
Peter Abelard in the 12th–13th centuries. Abelard was an enormous influence on his contemporaries and the course of medieval philosophical thought, but he has been known in modern times mainly for his connection with Héloïse. Only one of his strictly philosophical works, the ethical treatise "Scito te ipsum", had been published before the 19th century, in 1721. It was only with the publication by Cousin in 1836 of the collection entitled "Ouvrages inedits d'Abelard" that Abelard's philosophical work began to be studied more closely. Cousin's collection gave extracts from the theological work "Sic et Non" ("Yes and No") which is an assemblage