Pre-Augustine church fathers on man's free will.
Tertullian (AD145-220)
"Moreover, man thus constituted will be protected by both the goodness of God and by His purpose, both of which are always found in concert in our God. For His purpose is no purpose without goodness; nor is His goodness without a purpose, except forsooth in the case of Marcion’s God, who is purposelessly good, as we have shown. Well, then, it was proper that God should be known; it was no doubt a good and reasonable thing. Proper also was it that there should be something worthy of knowing God. What could be found so worthy as the image and likeness of God? This also was undoubtedly good and reasonable. Therefore it was proper that (he who is) the image and likeness of God should be formed with a free will and a mastery of himself; so that this very thing — namely, freedom of will and self-command — might be reckoned as the image and likeness of God in him. For this purpose such an essence was adapted to man as suited this character, even the afflatus of the Deity, Himself free and uncontrolled. But if you will take some other view of the case, how came it to pass that man, when in possession of the whole world, did not above all things reign in self-possession — a master over others, a slave to himself? The goodness of God, then, you can learn from His gracious gift to man, and His purpose from His disposal of all things. At present, let God’s goodness alone occupy our attention, that which gave so large a gift to man, even the liberty of his will. God’s purpose claims some other opportunity of treatment, offering as it does instruction of like import. Now, God alone is good by nature. For He, who has that which is without beginning, has it not by creation, but by nature. Man, however, who exists entirely by creation, having a beginning, along with that beginning obtained the form in which he exists; and thus he is not by nature disposed to good, but by creation, not having it as his own attribute to be good, because, (as we have said,) it is not by nature, but by creation, that he is disposed to good, according to the appointment of his good Creator, even the Author of all good. In order, therefore, that man might have a goodness of his own, bestowed on him by God, and there might be henceforth in man a property, and in a certain sense a natural attribute of goodness, there was assigned to him in the constitution of his nature, as a formal witness of the goodness which God bestowed upon him, freedom and power of the will, such as should cause good to be performed spontaneously by man, as a property of his own, on the ground that no less than this would be required in the matter of a goodness which was to be voluntarily exercised by him, that is to say, by the liberty of his will, without either favor or servility to the constitution of his nature, so that man should be good just up to this point, if he should display his goodness in accordance with his natural constitution indeed, but still as the result of his will, as a property of his nature; and, by a similar exercise of volition, should show himself to be too strong in defense against evil also (for even this God, of course, foresaw), being free, and master of himself; because, if he were wanting in this prerogative of self-mastery, so as to perform even good by necessity and not will, he would, in the helplessness of his servitude, become subject to the usurpation of evil, a slave as much to evil as to good. Entire freedom of will, therefore, was conferred upon him in both tendencies; so that, as master of himself, he might constantly encounter good by spontaneous observance of it, and evil by its spontaneous avoidance; because, were man even otherwise circumstanced, it was yet his bounden duty, in the judgment of God, to do justice according to the motions of his will regarded, of course, as free. But the reward neither of good nor of evil could be paid to the man who should be found to have been either good or evil through necessity and not choice. In this really lay the law which did not exclude, but rather prove, human liberty by a spontaneous rendering of obedience, or a spontaneous commission of iniquity; so patent was the liberty of man’s will for either issue. Since, therefore, both the goodness and purpose of God are discovered in the gift to man of freedom in his will, it is not right, after ignoring the original definition of goodness and purpose which it was necessary to determine previous to any discussion of the subject, on subsequent facts to presume to say that God ought not in such a way to have formed man, because the issue was other than what was assumed to be proper for God. We ought rather, after duly considering that it behooved God so to create man, to leave this consideration unimpaired, and to survey the other aspects of the case. It is, no doubt, an easy process for persons who take offence at the fall of man, before they have looked into the facts of his creation, to impute the blame of what happened to the Creator, without any examination of His purpose. To conclude: the goodness of God, then fully considered from the beginning of His works, will be enough to convince us that nothing evil could possibly have come forth from God; and the liberty of man will, after a second thought, show us that it alone is chargeable with the fault which itself committed." (Tertullian, Against Marcion, Bk. II, ch. vi)
"God put the question [to Adam - "where art thou"] with an appearance of uncertainty, in order that even here He might prove man to be the subject of a free will in the alternative of either a denial or a confession, and give to him the opportunity of freely acknowledging his transgression, and, so far, of lightening it. In like manner He inquires of Cain where his brother was, just as if He had not yet heard the blood of Abel crying from the ground, in order that he too might have the opportunity from the same power of the will of spontaneously denying, and to this degree aggravating, his crime; and that thus there might be supplied to us examples of confessing sins rather than of denying them: so that even then was initiated the evangelic doctrine, “By thy words thou shall be justified, and by thy words thou shalt be condemned.” (Tertullian, Against Marcion, Bk. II, xxv)
"That rich man did go his way who had not “received” the precept of dividing his substance to the needy, and was abandoned by the Lord to his own opinion. Nor will “harshness” be on this account imputed to Christ, the Found of the vicious action of each individual free-will. “Behold,” saith He, “I have set before thee good and evil.” Choose that which is good: if you cannot, because you will not — for that you can if you will He has shown, because He has proposed each to your free-will — you ought to depart from Him whose will you do not." (Tertullian, On Monogamy, XIV)
