 He also wrote a famous article, "Mea culpa d'un sceptique" in which he admitted he was deeply wrong, emphasized the importance of Altamira, accused himself of holding back the progress of his science, and harshly criticised himself for doing an injustice to an honest man and rejecting a thing without any investigation.Today, opinions about this article vary.Kleibl praises it as "one of the finest moments of prehistory" and a "brave article, showing no fear of hurting his" [Cartailhac's] "professional credit", while Lewis-Williams writes about it as an opportunist thing used calculatingly for Cartailhac's own benefit when his position was no longer tenable.