And you don’t have to take my word for it. Read Pelagius’ words yourself. He condemns himself (er…technically he is justifying himself, ha!):
That is why 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 and is not obliged by the overpowering inclination of his own nature to do good on compulsion and without any possibility of variation. 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 honour of our nature consists, it is from this that its dignity is derived and all good men win others' praise and their own reward. Nor would there be any virtue at all in the good done by the man who perseveres, if he could not at any time cross over to the path of evil.23
2. It was because God wished to bestow on the rational creature the gift of doing good of his own free will and the capacity to exercise free choice, by implanting in man the possibility of choosing either alternative, that he made it his peculiar right to be what he wanted to be, so that with his capacity for good and evil he could do either quite naturally and then bend his will in the other direction too. He could not claim to possess the good of his own volition, unless he were the kind of creature that could also have possessed evil. Our most excellent creator wished us to be able to do either but actually to do only one, that is, good, which he also commanded, giving us the capacity to do evil only so that we might do his will by exercising our own. That being so, this very capacity to do evil is also good - good, I say, because it makes the good part better by making it voluntary and independent, not bound by necessity but free to decide for itself. We are certainly permitted to choose, oppose, approve, reject, and there is no ground for preferring the rational creature to the others except that, while all the others possess only the good derived from their own circumstances and necessity, it alone possesses the good of free will also.
But most of those who, from lack of faith as much as of knowledge, deplore the status of man, are - I am ashamed to admit it - criticising the Lord's work and asserting that man ought to have been so made that he could do no evil at all, and we are then in a position where what is moulded says to its moulder: Why have you made me thus (Rom.9.20)? And these most shameless of men, while hiding the fact that they are managing quite well with what they have been made, would prefer to have been made otherwise; and so those who are unwilling to correct their own way of life appear to want to correct nature itself instead, the good of which has been so universally established in all that it sometimes reveals itself and brings itself to notice even in pagans who do not worship God. For how many of the pagan philosophers have we heard and read and even seen for ourselves to be chaste, tolerant, temperate, generous, abstinent and kindly, rejecters of the world's honours as well as its delights, lovers of justice no less than knowledge? Whence, I ask you, do these good qualities pleasing to God come to men who are strangers to him? Whence can these good qualities come to them, unless it be from the good of nature? And since we see the qualities of which I have spoken contained either all in one person or severally in several persons and since the nature of all is one and the same, by their example they show each other that all qualities which are found either all together in all or severally in each one are able to exist in all alike. But if even men without God can show what kind of creatures they were made by God, consider what Christians are able to do whose nature and life have been instructed for the better by Christ and who are assisted by the aid of divine grace as well.
4, 1. Come now, let us approach the secret places of our soul, let everyone examine himself more attentively, let us ask what opinion our own personal thoughts have of this matter, let our conscience itself deliver its judgement on the good of nature, let us be instructed by the inner teaching of the mind, and let us learn about each of the good qualities of the mind from no other source but the mind itself. Why is it, I ask you, that we either blush or fear at every sin we commit, displaying our guilt for what we have done at one moment by the blush on our countenance, at another by its pallor, anxiously trying to avoid any witness even of our smallest offences and suffering pangs of conscience all the while? And why, on the other hand, are we happy, resolute, bold after every good deed we have done and, if this fact is hidden from sight, desire and wish it to be seen in broad daylight? Why else unless it is because nature itself is its own witness and discloses its own good by the very fact of its disapproval of evil and, by putting its trust only in a good deed, shows what alone benefits it? Hence it comes about that frequently, though a murderer's identity remains concealed, torments of conscience make furious attacks on the author of the crime, and the secret punishment of the mind takes vengeance on the guilty man in hiding; nor is there any room for escape from punishment after the crime has been committed, since guilt is itself the penalty. That is why the innocent man, contrariwise, enjoys the peace of mind that comes from a good conscience even while undergoing torture and, though he fears punishment, still glories in his innocence.