Augustine quoted in the intermediary document
Marriage 2.2.4
“They do not notice that the good of marriage cannot be accused because of the original evil derived from it, just as the evil of adultery and sexual immorality cannot be excused because of the natural good born from it. For just as sin, whether derived from the one or the other, is the devil’s work, so a human being, whether born from the one or the other, is God’s work.”