Chapter 104.--God, Foreknowing the Sin of the First Man, Ordered His Own Purposes Accordingly.
Wherefore, God would have been willing to preserve even the first man in that state of salvation in which he was created, and after he had begotten sons to remove him at a fit time, without the intervention of death, to a better place, where he should have been not only free from sin, but free even from the desire of sinning, if He had foreseen that man would have the steadfast will to persist in the state of innocence in which he was created. But as He foresaw that man would make a bad use of his free-will, that is, would sin, God arranged His own designs rather with a view to do good to man even in his sinfulness, that thus the good will of the Omnipotent might not be made void by the evil will of man, but might be fulfilled in spite of it.
Chapter 105.--Man Was So Created as to Be Able to Choose Either Good or Evil: in the Future Life, the Choice of Evil Will Be Impossible.
Now it was expedient that man should be at first so created, as to have it in his power both to will what was right and to will what was wrong; not without reward if he willed the former, and not without punishment if he willed the latter. But in the future life it shall not be in his power to will evil; and yet this will constitute no restriction on the freedom of his will. On the contrary, his will shall be much freer when it shall be wholly impossible for him to be the slave of sin. We should never think of blaming the will, or saying that it was no will, or that it was not to be called free, when we so desire happiness, that not only do we shrink from misery, but find it utterly impossible to do otherwise. As, then, the soul even now finds it impossible to desire unhappiness, so in future it shall be wholly impossible for it to desire sin. But God's arrangement was not to be broken, according to which He willed to show how good is a rational being who is able even to refrain from sin, and yet how much better is one who cannot sin at all; just as that was an inferior sort of immortality, and yet it was immortality, when it was possible for man to avoid death, although there is reserved for the future a more perfect immortality, when it shall be impossible for man to die.
Chapter 106.--The Grace of God Was Necessary to Man's Salvation Before the Fall as Well as After It.
The former immortality man lost through the exercise of his free-will; the latter he shall obtain through grace, whereas, if he had not sinned, he should have obtained it by desert. Even in that case, however, there could have been no merit without grace; because, although the mere exercise of man's free-will was sufficient to bring in sin, his free-will would not have sufficed for his maintenance in righteousness, unless God had assisted it by imparting a portion of His unchangeable goodness. Just as it is in man's power to die whenever he will (for, not to speak of other means, any one can put an end to himself by simple abstinence from food), but the mere will cannot preserve life in the absence of food and the other means of life; so man in paradise was able of his mere will, simply by abandoning righteousness, to destroy himself; but to have maintained a life of righteousness would have been too much for his will, unless it had been sustained by the Creator's power. After the fall, however, a more abundant exercise of God's mercy was required, because the will itself had to be freed from the bondage in which it was held by sin and death. And the will owes its freedom in no degree to itself, but solely to the grace of God which comes by faith in Jesus Christ; so that the very will, through which we accept all the other gifts of God which lead us on to His eternal gift, is itself prepared of the Lord, as the Scripture says. [1299]
[1299] Prov xvi. 1. ["The preparation of the heart in man... is from the Lord." A.V.]