Prosper of Aquitaine:
The opinion they hold is as follows: Every man has sinned in Adam, and no one is reborn and saved by his own works but by God's grace. Yet, all men without exception are offered the reconciliation which Christ merited by the mystery of his death, in such manner that whosoever wish to come to the faith and to receive baptism can be saved. God has foreknown before the creation of the world who they are who will accept the faith and with the help of further grace persevere in it. He has predestined for his kingdom those who, called without any merit of their own, He foreknew would be worthy of their election and depart from this life by a good death. Accordingly, every man is urged by the teachings of Holy Scripture to believe and to work, and no one should despair of attaining eternal life, the reward prepared for those who serve God freely. But as to the decree of God's special call by which He is said to have separated the elect and reprobate, either before the creation of the world or at the very creation of the human race, and according to His own good pleasure, so that some are born vessels of honor, others vessels of dishonor, this, they say, takes away from sinners an incentive for conversion and gives the pious occasion for lukewarmness. For both of them, exertion becomes superfluous if neither diligence can save a reprobate nor negligence ruin an elect. Whatever way they behave, nothing can happen to them except what God has decreed. With such doubtful prospects no man can follow a steady course of action, since all pains a man takes one way or another are of no avail if God's predestination has decreed otherwise. To teach that the decree of God anticipates the wills of men is to invite them to cast aside all diligence and give up the effort for virtue; it is, under cover of predestination, to set up a sort of fatal necessity, or to say that the Lord has made men of different natures, if it is true that no one can change his condition of elect or reprobate in which he was created. To put their opinions more briefly and fully: the very objections which in your book On Admonition and Grace you took from the idea of your opponents and proposed to yourself, and the objections of Julian also which in your books against him you relate in this matter and which you answered fully, exactly these our good Christians greet with loud approval. When we show them the writings of Your Holiness which abound in countless unanswerable proofs from Holy Scripture, when we ourselves try, after the pattern of your tracts, to construct some new argument to counter them, they take cover for their obstinacy by appealing to the ancient teaching. The text of the Apostle Paul to the Romans, which you quote to prove that divine grace precedes the merits of the elect, they say was never understood by any of the churchmen in the sense in which you take it now. And when we ask them to explain it themselves according to the meaning given by the authors they prefer, they answer that they have found there nothing which satisfies them, and they ask us not to speak about things whose depth no one is able to fathom. Finally, in their obstinacy they go to such length as to assert that what we teach as being of faith is harmful to the spiritual good of those who come to hear of it; and even if it were true, we should not come out with it, because it does harm to preach what will not be well received, and there is no harm in not speaking of what no one can understand.- Prosper of Aquitaine, Letter to Augustine, Section 3, translation by P. De Letter, S.J., Ph.D., S.T.D. in "Prosper of Aquitaine: Defense of St. Augustine," pp. 39-41 (Newman Press, New York: 1963).
Notice, for instance, the allegations of universal prevenient grace, and the allegations that Augustinian theology will hurt evangelism. The answers from the real Turretin that Pastor White brings to bear are right on the money.
It's also interesting to note that Prosper is relying on the authority of Scripture over against semi-Pelagian attempts to say that Augustine's view was a theological novelty. We sometimes hear the same allegations about our views today - but ultimately we agree with Prosper that Scripture (not the forerunners of Augustine or even Augustine himself) is our rule of faith.