He is a Christian ... - Pelagius

When will a man guilty of any crime or sin accept with a tranquil mind that his wickedness is a product of his own will, not of necessity, and allow what he now strives to attribute to nature to be ascribed to his own free choice? It affords endless comfort to transgressors of the divine law if they are able to believe that their failure to do something is due to inability rather than disinclination, since they understand from their natural wisdom that no one can be judged for failing to do the impossible and that what is justifiable on grounds of impossibility is either a small sin or none at all.

Under the plea that it is impossible not to sin, they are given a false sense of security in sinning ... Anyone who hears that it is not possible for him to be without sin will not even try to be what he judges to be impossible, and the man who does not try to be without sin must perforce sin all the time, and all the more boldly because he enjoys the false security of believing that it is impossible for him not to sin ... But if he were to hear that he is able not to sin, then he would have exerted himself to fulfil what he now knows to be possible when he is striving to fulfil it, to achieve his purpose for the most part, even if not entirely.

We must now take precautions to prevent you from being embarrassed by something in which the ignorant majority is at fault for lack of proper consideration, and so from supposing with them, that man has not been created truly good simply because he is able to do evil. ... If you reconsider this matter carefully and force your mind to apply a more acute understanding to it, it will be revealed to you that man's status is better and higher for the very reason for which it is thought to be inferior: it is on this choice between two ways, on this freedom to choose either alternative, that the glory of the rational mind is based, it is in this that the whole honor of our nature consists, it is from this that its dignity is derived.