St. Augustine wrote in his Retractions 2:23: "After I had written 'on the Good of Marriage,' it was expected that I should write on Holy Virginity; and I did not delay to do so: and that it is God's gift, and how great a gift, and with what humility to be guarded, so far as I was able I set forth in one volume. This book begins," etc. - Summary by St. Augustine