Augustine did not believe in free will, at least not in the way that libertarian Christians do. Libertarian free will is the belief that our choices are free from the determination or limitations or restrictions of human nature and that our choices are not predetermined by God. All "free will theists" claim that libertarian freedom is necessary for responsibility concerning morals, for if our choice is determined or engendered by anything, containing our own desires, in the mind of "free will theists", it cannot reasonably be called an unaffected choice. On account of the previous part of this definition, freedom according to Libertarians is, the freedom to neglect acting as someone's nature tells someone to do, that includes the tendency to act in a particular way and to follow your greatest wishes. For them responsibility means in perpetuum that that specific person could have done differently. (Theopedia, s.d.)
As stated above, he believed in the doctrine of “total depravity”. It is commonly known that the term was invented later on by theologian John Calvin, but it is basically the same belief: 1) “Calvin wrote concerning Psalm 51:5 that David confessed that his nature was entirely depraved. On the same page of his commentary he wrote that the passage gives us a look into a touching and powerful testimony which proves that original sin descended from Adam on all human beings.” 2) “Because humanity rebelled to the fullest, human beings can do nothing but sinning. Man cannot stop rebelling. He cannot turn to God and start doing only good; the just price for this rebellion is eternal retribution.” It is clear that this well-known teacher Calvin based this idea on Augustine’s writing. “But before Augustine the Church taught total free will and condemned the unorthodox Gnostics who proclaimed that man had no free will.”
My personal view on original sin is that if God would judge one for the deeds he or she did not commit, (or was not capable of not committing,) that would be as fair as a judge of this world condemning a man or woman, innocent of the crime he is being accused of, to life sentence, yes even to death row. It would be as fair as the judgement of the crucifixion of our Lord and Savior Jesus Christ. Paul declares in Romans chapter 3 verse 5a (KJV): “But if our unrighteousness commend the righteousness of God, what shall we say? Is God unrighteous who taketh vengeance?” Lawfully correct vengeance is taken when one person committed a wrong to another person (that is unrighteousness) and that person pays the other person with equal amount (that is righteousness). It is clear that the Roman laws of this world were given, in a way, to give abused people the right to get vengeance, as righteous as possible. How much more the laws ordained by God, through Holy Scriptures in His divine wisdom and righteousness?
I, for one, believe that once we start sinning with a perfect free will, we keep that perfect free will but we start getting addicted to sin. This does not mean we have to give in to it. Due to our addiction, we will tend to lean more towards the evil than towards the good. Without repentance we will sin more and more often, as corruption, especially pride will run deeper and deeper into our souls... (It should be made clear that we are fully responsible for this process)
Pride is an evil poison that blinds us by our consent. If we stick to our pride, Christ will eventually condemn us at the judgment seat of Christ, for we did not repent of a lifestyle full of sin and therefore we proved that we did not truly (care about and) trust on the sacrifice the Christ made on the cross.
As it is written that God will lift up the humble and smack down the proud (paraphrase of James 4:6b).
Calvin, J. (1557 / 1846 / 1970). Calvin's Commentaries Volume 5; Commentary Upon The Book of Psalms Volume 2. In J. Calvin, & T. C. Society (Ed.), Calvin's Commentaries Volume 5; Commentary Upon The Book of Psalms Volume 2 (R. J. Anderson, Trans., 1 (1970) ed., Vol. 2, p. 290). Geneva / Scotland / Michigan, Geneva / Scotland / Michigan, Switzerland / Great Britain / United States: John Calvin.
MM. (2008, May 21). Augustine's Problem with Total Depravity. Retrieved October 1, 2014, from Vocatum: http://vocatum.blogspot.be/2008/05/augustines-problem-with-total-depravity.html