Nicene and Post-Nicene Fathers, Vol. III:
Doctrinal Treatises of St. Augustin: Chapter 104

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.