Pelagianism views humanity as basically good and morally unaffected by the Fall. It denies the imputation of Adam's sin, original sin, total depravity, and substitutionary atonement. It simultaneously views man as fundamentally good and in possession of libertarian free will. With regards to salvation, it teaches that man has the ability in and of himself (apart from divine aid) to obey God and earn eternal salvation. Pelagianism is overhwhelmingly incompatible with the Bible and was historically opposed by Augustine (354-430), Bishop of Hippo, leading to its condemnation as a heresy at Council of Carthage in 418 A.D. These condemnations were summarily ratified at the Council of Ephesus (A.D. 431).