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

As regards the plan of the Epistle, it has been often asserted till lately that it was supposed to be but fragmentary, a series of aphorisms. Augustine, however, without formally announcing a plan as discovered by him in the Epistle, not only frequently affirms in his exposition that charity or love is the Apostle's main theme, but so conducts the discussion, gathering his arguments and illustrations around this central thought, as to render it evident that in his view the purpose and plan of the Apostle is to set forth love in its essence and its scope, and that he intends to make this thought dominant in every part. - Summary by Philip Schaff